Efficiency evaluation of BRICS’s national innovation systems based on bias-corrected network data envelopment analysis

The very limited studies that tried to measure the efficiency of national innovation systems (NISs) in BRICS economies were limited to the assumption that the innovation process at national level consists of one stage only and got different and conflicting results. Therefore, this study endeavours to measure the efficiency of sub-processes within the BRICS’s NISs and identify where the system failure lies in each NIS. Bias-corrected network data envelopment analysis (DEA) is used to measure the efficiency of total NIS and the efficiency of the other sub-processes within the system: (1) knowledge production process (KPP), and (2) knowledge commercialization process (KCP). The results showed that NISs in BRICS economies suffer from low performance in commercializing their outputs of universities and research organizations. While, on the other hand, their performance in creating scientific and technical knowledge is good in comparison to other studied countries. We suggest that the reason behind this imbalance is the network system failure associated with weak institutions and high uncertainty in the economy. In this study, we argue that the problem in BRICS NISs is not a problem of resources, but it is a problem of system management and institutions. Some bridging policies are suggested to be adopted by BRICS economies to improve their innovation performance and overcome the system failure of weak links between universities and industry.


Introduction
Building a globally competitive economy today requires an economy with a high intensity of innovation activities at the national level. This innovativeness is a decisive factor that determines the potential of economic expansion and development of any economy since the economies of scale and low labour wages are no longer as decisive as they were two decades ago. Especially in emerging economies like BRICS economies. Therefore, there is a need for building an efficient national innovation system (NIS) in these countries in order to improve their economic competitiveness and sustainable economic growth based on innovation-related sources.
As a result of a highly competitive global environment, policymakers need to ensure that their innovation policies and strategies are sound and oriented precisely towards overcoming the weakness and shortcomings of their NIS. This process requires a profound analysis of NIS and all its actors, their relationships and the structural patterns of its progress overtime (Castellacci & Natera, 2013).
The notion of national innovation system as a systematic framework for studying creation, dissemination and exchanging of knowledge and technologies at the national level was firstly introduced by (Freeman, 1982;Freeman & Lundvall, 1988). This concept has been developed since that time to include all institutions, organizations and actors engaged in the innovation-related activities at sectoral, regional and national levels (Edquist, 2009;Nelson, 1993). The procedural objective of this conceptual framework is to study the relationships between the main actors within NIS and the needed mechanisms to develop these relationships to be more productive and efficient.
However, previous studies did not answer the following question: do the NISs in these economies work efficiently? The very limited studies that tried to measure the efficiency of NISs in BRICS economies based on conducting the Data Envelopment Analysis (DEA) were limited to the assumption that the innovation process at national level consists of one stage only (Cai & Hanley, 2012;Liu & White, 2001;Viotti, 2002). These studies treated NIS as one unit, neglecting the fact that the efficiency score of the total system does not demonstrate the sub-systems' efficiencies scores (Cron & Sobol, 1983;Kao & Hwang, 2008Li et al., 2016;Wang et al., 1997).
Therefore, this study tries to answer the following questions: (1) Do the NISs in BRICS countries work efficiently? (2) What types of inefficiencies do these systems suffer from?
Drawing on the work of Carayannis et al. (2015), Cook et al. (2010), Guan and Chen (2012) and Li et al. (2016), we assume in this study that the innovation process at the national level consists of two main processes: (1) knowledge production process (KPP) and (2) knowledge commercialization process (KCP), where these two processes cover all functions of the NIS's actors: universities, business sector and government.
Accordingly, this study aims at measuring the efficiency of BRICS's NISs of two innovation-related processes and identifying where the system failure lies in each NIS.
This study endeavours to fill this research gap by conducting the data envelopment analysis (DEA) to provide the policymakers with profound insights about the structural functioning of their NISs. Moreover, this study provides the answer to the following question: are the BRICS's NISs working efficiently or not, and if they are not, what kind of system failure they suffer from and in which process?
This study is structured as follows. First, we revise the literature of NIS's efficiency studies in developing economies, in addition to those that have been conducted in BRICS economies. Second, we illustrate the data and methodology used in this study. Third, we present and discuss the results. Finally, we draw our conclusion and provide some recommendations.

Literature review
The development of economic activities as a result of utilizing the outputs of digital and technological revolution has led to increasing the intensity of innovations at micro, meso and macroeconomic levels. This kind of progress included radical changes in the productivity and the mechanisms of innovation creation and diffusion, which in its turn led policymakers to devise theoretical and practical frameworks to measure the impact of innovation activities on the national economic performance. In other words, there was a need to find a new analysis framework to help policymakers explain the way in which new innovations and technologies emerge and diffuse at the national level and how these technologies and innovations influence the overall socio-economic performance.
These conditions have led to the emergence of the NIS as a systemic framework for analysing the economic performance associated with innovative activities, creating, disseminating and exchanging high technologies (Freeman, 1982;Freeman & Lundvall, 1988;Godin, 2009;Lundvall, 2007). This analysis framework is used to study the relationships among the main actors within NIS and the needed mechanisms to develop these relationships and make them more productive and efficient. Accordingly, the concept of the NIS is an important conceptual framework in the context of studying and analysing the emergence and diffusion of new technologies and innovations at the national level (Metcalfe & Ramlogan, 2008).
That being said, the NIS concept has been witnessed three main shifts: (1) shift towards macro structures of NIS and the interactions between the main actors within the system (Chen & Guan, 2011); (2) shift towards technology, sectoral and regional innovation systems with special focus on the developing economies (Andersen et al., 2014;Malerba, 2002); and (3) growing emphasis on the internationalisation of NISs and the role of multinational corporations (MNCs) as a channel for global knowledge and innovation practices flows (Chung, 2002;Distefano et al., 2016;Watkins et al., 2015). These shifts paved the way for studying the NISs in developing economies, and especially those that have achieved and maintained high and extensive economic growth rates over a decade.
Regarding the NISs in BRICS economies, they were included gradually in the NIS literature because of two main reasons: (1) BRICS economies had not built yet mature NISs (Kravtsova & Radosevic, 2012), where their innovation activities were focused on specific sub-innovation processes in specific regions or industries (Watkins et al., 2015), (2) the economic openness and the development inclusion, that imposed the priority of building a national innovation network (Scerri & Lastres, 2013).
In this context and since the economic and social development of countries depends on a country's capacity to create, disseminate and apply new knowledge and technologies (Metcalfe & Ramlogan, 2008;Yao et al., 2009), it was important to ensure that NIS's functions and processes work efficiently. In doing so, several studies tried to measure the efficiency of NISs and other types of innovation systems (regional, sectoral and technology systems) in different countries, BRICS economies are included, to assess the role of these systems in the sustainability of economic growth (Afzal, 2014;Matei & Aldea, 2012;Samara et al., 2012;Tseng, 2009;Zemtsov & Kotsemir, 2019). Moreover, the efficiency measurement studies of innovation systems were oriented towards analysing the dynamic progress of these systems over time, in addition to identifying the system failures associated with low-efficiency levels (Guan & Chen, 2010. Applying DEA approach is one of the most widespread methods of measuring the innovation system performance. Building on the work of (Emrouznejad & Yang, 2018), between 1980 and 2019, more than 4200 DEA-related articles were published in the Scopus database. This growing tendency indicates the importance and implication benefits that DEA provides in the field of efficiency measurement studies. In this paper, we are interested in the innovation system related studies since our aim is to measure and analyse the efficiency of the NISs in BRICS countries.
Innovation system is a multilevel concept (Carayannis et al., 2016), where national, regional and sectoral innovation system can coexist and coevolve together in the same country. Accordingly, the existing literature of measuring the efficiency of innovation systems is divided into three categories. First, studies that measure the efficiency of the NIS (NIS) (Abbasi et al., 2011;Sharma & Thomas, 2008;Wang & Huang, 2007). Second, studies that measure the efficiency of the regional innovation system (RIS) Didenko et al., 2017;Guan & Chen, 2010;Lengyel & Leydesdorff, 2011;Zabala-Iturriagagoitia et al., 2007). Third, studies that measure the efficiency of the sectoral innovation system (SIS) (Andersen et al., 2014;Liu et al., 2018;Meng et al., 2006).
However, most of previous studies that tried to evaluate the efficiency of NIS treated it as a one decision unit, which does not provide any insights to the policymakers (Grupp & Schubert, 2010;Jiménez-Sáez et al., 2011;Lee & Park, 2005;Namazi & Mohammadi, 2018;Pan et al., 2010;Ramanathan et al., 2018;Wang, Fan, et al., 2016;Zabala-Iturriagagoitia et al., 2007), leaving them with just an idea that their NIS works or does not work efficiently. Even this piece of information is not accurate enough to build on it any policy. In other words, the implication value of this kind of analysis is very low. What we are essentially arguing in this article is that measuring the efficiency of NIS should consider not only the overall innovation process but also all other subprocesses involved in this system.
Given the limitations of the previous DEA approaches, some studies applied additional econometric analyses such as Tobit regression (Afzal, 2014;Matei & Aldea, 2012) to investigate the impact of the environmental factors on the innovation performance, and super efficiency Pan et al., 2010) to generate a corrected ranking system. However, these additional econometric analyses do not help in demonstrating the relationship and interactions of the innovation processes within the NIS. Therefore, network DEA approach was applied to analyse the interaction between sub-innovation processes within the NIS (Carayannis et al., 2015) and the path of productivity gain of national innovation systems and its relationship with the technological improvements in the context of catch up process (Zabala-Iturriagagoitia et al., 2020).
Accordingly and in line with the existing literature (Carayannis et al., 2016;Chen et al., 2018;Kou et al., 2016;Liou, 2009), we propose using DEA network by splitting the overall national innovation process into two sub-processes: knowledge production process (KPP) and knowledge commercialization process (KCP). By doing so, policymakers will be able to get some insights about the overall performance of their NIS in addition to the performance of other sub-processes, which in its turn will help them in identifying what kind of system failure they are dealing with and how the allocation of sources could be made better.
Interestingly, when it comes to the efficiency measurement of BRICS's NISs, the literature is very limited and cases study oriented. There are only three studies that have measured the efficiency of NISs in these countries together. Cai (2011) has studied the NISs of 22 countries including BRICS and G7. The findings of this study showed that BRICS's NISs have low performance in terms of their governance, in addition to a high dependency on natural resources. Cai argued that extensive economic growth does not enhance the competitiveness of BRICS economies. Therefore, he suggested transferring BRICS's factor-driven growth patterns into innovation-driven growth patterns. It is worth mentioning here that the absence of bias test for the efficiency results in this study led the author to inconsistent conclusions, for example, the negative relationship between the proxy variables of education system and the efficiency level of NIS. Cai and Hanley (2012) have studied BRICS's NISs by conducting two-stages DEA method. They found that technological similarity is not the only criterion underpinning innovative performance. They argued that the socio-economic conditions also play a role in determining the innovativeness of country. The findings of this study showed that China, India and Russia demonstrate relatively high-efficiency scores, whereas both Brazil and South Africa perform badly. Authors linked the "bad" performance of Brazil and South Africa with their strongly performing natural resources sector. In this context, it should be said that if that is so, how do the findings of this study explain the high-efficiency score of Russia? The main drawback of this study is treating the NISs as one decision unit omitting the fact that the national innovation performance cannot be analysed as one simple process with inputs and outputs. Brando Santana et al. (2015) supposed that technological innovation should positively contribute to achieving sustainable development. The results of this study showed that Brazil, South Africa and India have the highest efficiency scores among BRICS economies, whereas Russia and China have the worst innovation performance. Interestingly, the results of Brando Santana et al. (2015) study are exactly the opposite of the Cai and Hanley study (Cai & Hanley, 2012). We suggest that the reasons behind that are as follows: (1) choosing different variables to represent the inputs and outputs of NISs, for example the inputs in the Cai and Hanley study are outputs in the Brando et al. study, (2) using different scales and returns orientations and (3) using different bias test analysis.
Summing up, there were numerous studies that used the DEA methods to measure the efficiency of NISs. However, very limited studies conducted this analysis on BRICS's NISs, and those who used it got different and conflicting results because of various reasons as mentioned earlier. Therefore, this study endeavours to fill this research gap by (1) conducting bias-corrected DEA network analysis on the BRICS's NISs, and (2) considering the complexity of the national innovation activities by splitting the national innovation processes into two sub-processes.

Methodology and data
Drawing on the seminal work of Charnes et al. (1978) who proposed a nonparametric programming model (CCR) 1 to measure the efficiency of different decision making units (DMU), and the dual convex model (BCC) 2 introduced by Banker et al. (1984) to measure the technical and scale efficiency with reference to the efficient frontier, we use DEA method in this study to measure the relative efficiency scores of BRICS's NISs. However, these original DEA works were developed to measure the efficiency of DMU as a whole unit (Kao, 2014), without considering the performance of other subprocesses within this unit. Therefore, in this study, we use the advanced model of the DEA method, that is network DEA, which was introduced by Färe and Grosskopf (2000) and Wang et al. (1997).
The reason behind using such a method is that DEA does not assume any relative importance, weights or even mathematical hypotheses of inputs and outputs; besides, it is a nonparametric method that is less restrictive than parametric models. Moreover, the DEA is essentially based on the Pareto optimality principle (Charnes et al., 1985), where any decision-making unit is considered inefficient if any other decision-making unit or a combination of units were able to produce the same outputs by using fewer inputs than this unit used.
In this study, as mentioned earlier, the NIS was divided into two sub-processes: Knowledge production process (KPP): at this stage, the efficiency of the technical and scientific knowledge production process is measured. The main actors in this process are the universities and R&D organizations. Knowledge commercialization process (KCP): at this stage, the efficiency of the knowledge monetization process is measured. In other words, the efficiency of transforming technical and scientific knowledge into innovation products and new technologies. The inputs of this process are at the same time the outputs of the previous process (KPP), in addition to the other inputs that are not outputs of the KPP and related to the national innovation process.
The inputs and outputs of these two processes were taken at different time intervals with a time lag of 2 years between the inputs of the KPP and the outputs of the KCP.
As shown in Fig. 1, each process includes three inputs and two outputs variables (see the descriptive statistics of all included variables in Table 1).
In the Table 9 in Appendix, data used in this study is provided. Selecting the sample of countries was based on two criteria. First, according to Cooper et al. (2006), the number of studied countries should be greater than the combined number of inputs and outputs. Otherwise, a large portion of studied countries will be identified as efficient due to an inadequate number of degrees of freedom. Accordingly, the number of studied countries should exceed the combined number of inputs and outputs by several times. Second, we chose countries from the OECD group, where this group of countries is considered, to some extent, similar to the BRICS countries in terms of economic performance. We argue that comparing BRICS economies with other least developed economies will not help in showing the real innovation performance of this group of countries.
The methodology consists of three stages: A. Inputs and outputs selection: this selection was based on an extended review of previous empirical studies that used different DEA methods to measure the efficiency of NIS-related processes as shown Table 10 in Appendix.
After that, a correlation matrix analysis was done to ensure that inputs and outputs have a significant correlation. The correlation matrixes of three NIS's processes are represented in Tables 2, 3 and 4.
The reason behind conducting the correlation matrixes analysis is to test the construct validity of our model (Golany & Roll, 1989;Lu et al., 2014). The results of the correlation matrixes analysis show that all inputs and outputs of all processes are significantly correlated. This means that the DEA model of NIS's sub-processes has high construct validity.
B. Returns selection: in order to select what kind of returns to scale we will use in our model, we draw on the work of Kneip et al. (2011) in identifying the return to scale (RTS) by conducting a RTS-test for all three processes: KPP, KCP and Total. The null hypothesis of this test is that the appropriate returns to scale are the constant returns to scale. The results of this test are represented in Table 5. Table 5 show that variable returns to scale (VRS) is the appropriate method to use for all processes, where the p value of all processes leads to rejecting the null hypothesis at α = 10%. This means that the variable returns to scale will be used in this study. In this context, it is worth mentioning that the RTS-test results are consistent with the structure of the studied NISs (DMUs) in this study, where all of them work at different scales. Moreover, the constant returns to scale method essentially measures scale efficiency without providing any information about the stage or the returns direction of the innovation activities. On the other hand, the variable returns to scale method measures the management efficiency of the innovation process regardless of the size of DMU. It is also better in identifying the future directions of the national innovation policies, both at the level of knowledge production and the commercialization of this knowledge. It also should be noted that all studied NISs in this study operate under incomplete competition with different institutional structures. Therefore, the variable returns to scale will be adopted in this study. C. Orientation selection: Input-oriented model with variable returns to scale was selected in the knowledge production process (KPP), where actors in general, and the government in particular, are able to control inputs more than outputs at this stage. In addition, this stage is the first stage in the innovation process, thus focusing on the input side to build the national innovation and technological capabilities and capacities needed to produce scientific and technical knowledge is the core objective at this stage. Regarding the knowledge commercialization process (KCP), output-oriented model with variable returns to scale was selected since the main objective of the companies and the system is to maximize the outputs of the innovation process as much as possible.

Efficiency measurement model
We have two processes, where each DMU, NIS in this study, has m 1 inputs X i 1 j (i 1 = 1, …. , m 1 ) and s 1 outputs Y r 1 j (r 1 = 1, …. , s 1 ) for the KPP, and has m 2 inputs X i 2 j (i 2 = 1, …. , m 2 ) and s 2 outputs Y r 2 j (r 2 = 1, …. , s 2 ) for the KCP. Moreover, there are P intermediate Z pj (p = 1, …. , q). These intermediates are the link between the KPP and KCP. Let u r 1 , u r 2 , v i 1 , v i 2 and w p denote unknown positive values above ε (non-Archimedean number). The overall efficiency of NIS can be defined as follows: E j is the ratio of the aggregated weighted outputs to the aggregated weighted inputs of the two processes. The overall efficiency E j is a combination of two efficiencies E 1 j for the KPP efficiency score and E 2 j for the KCP efficiency score. So, the overall convex efficiency can be defined as follows: where Ϣ j denote the utilized portion of system aggregate inputs in the KPP, while 1-Ϣ j is the utilized portion of the system aggregate inputs in the KCP. Based on Kao and Hwang (2008), the outputs of the first process (KPP) should be the inputs of the second process (KCP). So, the CRS model (Charnes et al., 1978) of the overall efficiency of a DMU j 0 can be calculated as follows: where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n Transformation of the previous model into a linear program model can be solved as follows: where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n In the same way, we calculate the efficiency of two sup-processes (KPP and KCP).
where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n and where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n All previous models (Eqs. 1 to 6) work under the assumption of constant returns to scale (CRS) and outputs oriented, but the RTS-test showed that the appropriate model is the variable returns to scale (VRS) with an inputs-oriented model for the KPP and outputs-oriented for the KCP and the overall innovation process. Therefore, deriving from Banker et al. (1984), Chen et al. (2009), Didenko et al. (2017, Guan and Chen (2012) and Wang and Chin (2010), the previous models are transformed as follows:

VRS-output-oriented model of the overall innovation process (NIS)
The primal equation of VRS-output-oriented model is as follows: where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n μ 1 j 0 and μ 2 j 0 represent the direction of returns and they are free of sign scalers that used in the VRS model. So, if μ j 0 > 0, this means we have decreased returns; if μ j 0 < 0, this means we have increased returns; and if μ j 0 = 0, then the returns are constant.
The dual linear programming model is as follows: where λ j ≥ 0 and represents the associated weighting of outputs and inputs of DMU j .

VRS-input-oriented model of KPP
The primal equation of VRS-input-oriented model is as follows: where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n The dual linear programming model is as follows:

VRS-output-oriented model of KCP
The primal equation of VRS-output-oriented model is as follows: where u r 1 , u r 2 , v i 1 , v i 2 and w p ≥ ε; j = 1, 2, …, n The dual linear programming model is as follows: All previously formulated equations are not bias corrected, where the efficiency scores of DEA are subject to sampling variation of frontier (Tsolas, 2011). The core idea behind the bootstrapping is to estimate the efficiency scores based on multiple sampling process (Simar & Wilson, 1998). To avoid the bias of the b θ i value to one, we generate a simulated data that is approximately equivalent to the original one (Kneip et al., 2011;Simar & Wilson, 2007). The distributions and standard deviations of the bootstrapped samples are close to the original data. Accordingly, the bias corrected efficiency score can be formulated as follows: Where where b = 1…, B is a sample generated fromθ 1 toθ j .

Results and discussion
As shown in Table 6, the results of VRS-input-oriented model show that only 10 of 24 countries are efficient in producing scientific and technical knowledge (KPP), whereas the results of VRS-output-oriented model show that only 12 of 24 countries are efficient in terms of commercializing this knowledge (KCP). On the other hand, the results of DEA for the total innovation process show that only 13 of 24 countries are efficient. However, none of all studied countries was efficient without being efficient at least in one sub-process. It should be mentioned here that the VRS model measures the efficiency of resources management, not the scale efficiency because all studied NISs work under different scales.
Regarding the efficiency scores of the BRICS NISs, all of them were ranked at the bottom of the studied countries list. Moreover, BRICS economies suffer from low performance in terms of knowledge commercialization, where all of them have a very lowefficiency score in comparison to other studied countries. On the other hand, the performance of BRICS economies in terms of knowledge production is better than their performance in commercializing this knowledge, where India and China perform well in comparison to other BRICS countries.
To identify what measures need to be taken to make the knowledge production and knowledge commercialization processes work efficiently, a projection analysis was done. The values of projection analysis, as shown in Table 7, were calculated through the Eqs. 8, 10 and 12. The results in Table 7 show how much countries should decrease their innovation inputs, in inputs-oriented model, or increase innovation outputs, in outputs-oriented model, to work at optimal scale with the best possible efficient performance.

Table 6 DEA network results
Final efficiency rank is the average ranking value of three processes: KPP, KCP and total innovation process Table 7 DEA's projection results The projection results are linked to the orientation models of each process, where the table includes the projection results of the inputs of the KPP since the KPP is input oriented. The results also show only the projection values of outputs variables for both KCP and total innovation process since these two processes are output oriented A country like Russia, for example, suffers from a low performance at both innovationrelated processes: KPP and KCP. The projections analysis in Appendix, of KPP efficiency score in Russia shows that if Russia wants to achieve the KPP efficiency score of 100% (1.00) with the current level of output variables, Russia should decrease expenditure on R&D by government and education sector (X1 and X3) by 60.1% and the number of researchers (X2) by 33.5%. These figures indicate incompetence in managing the inputs of KPP. In other words, this low performance at both innovation-related processes represents the waste of resources that can be reallocated in other areas such as creating business incubators, innovation parks and technological clusters.
In the same context, the projection analysis of KCP efficiency score in Russia shows that if Russia wants to achieve the KCP efficiency score of 100% (1.00), it should increase outputs of the knowledge commercialization process by 93.3%. This means that the Russian innovation system has very low performance in terms of transforming the outputs of KPP into innovation products and services. This situation reveals a network system failure associated with weak linkages among universities and industry because of many institutional obstacles that generate a high-risk business environment and market uncertainty (Hekkert et al., 2007;Klein Woolthuis et al., 2005). This means that the problem in the Russian innovation system is not a problem of resources, but it is a problem of system management and institutions. This situation can be found in all other BRICS economies in different forms.
For a more in-depth analysis of the efficiency analysis results, we analyse the correlation matrix between the three models (KPP, KCP and total). The correlation matrix among these three processes shows the causal relationship between the overall innovation process and the sub-processes: (1) the KPP, (2) and the KCP.
According to the DEA results, NISs can be classified into four groups as shown in Fig. 2. A. Innovation latecomers: this group includes the weakest innovation systems, where both KPP and KCP do not work efficiently. As mentioned earlier, this is mainly due to poor resources management at scales that are disproportionate to the intensity and development level of innovative and technological activities. These countries need to reduce the KPP inputs and focus on reallocating their resources based on adopting new management paradigms. Without doing so, any further investments in the KCP will be futile as long as the outputs of KPP are low. B. Knowledge production leaders: this group includes NISs with a good education system with a good efficiency score of KPP. However, the commercialization process of the outputs of KPP does not work efficiently. Therefore, these countries should improve the synergistic relationships between main NIS's actors by building bridging organizations, enablers and a stimulating institutional environment. Moreover, promoting trade openness and protecting intellectual property rights are essential prerequisites for utilizing patents and technology transfer. C. Knowledge commercialization leaders: this group includes NISs that have a good performance in commercializing their knowledge. However, the KPP in universities in these NISs is not up to the level of development of innovation activities in the industry. This situation leads to a weak innovation performance at the national level. This group of countries needs to reallocate R&D resources into improving the KPP performance. In other words, enhancing mechanisms and dynamics of knowledge production in universities and research centers by supporting them through grants programs oriented towards specific national technological priorities.
In addition to creating joint research programs gathering universities with business sector. D. Innovation leaders: this group includes NISs that have a very good performance at both KPP and KCP. Countries in this group are efficient at resources management and thy work at a good scale. To maintain their leadership, these countries need to increase their innovation inputs and constantly invest in new technologies as a part of a leadership strategy. This kind of innovation behaviour has a direct impact on national wealth creation.
In consistent with the previous theoretical illustration, studied NISs were classified based on the bias-corrected efficiency scores results of the DEA analysis as shown in Fig. 3.
Since all studied countries have a high efficiency score in KPP, we have raised the threshold to 0.6. On the other hand, there are not many countries they have a high efficiency score in KCP; therefore, we lowered the threshold to 0.4. As shown in the previous figure, all NISs of BRICS economies, except Russia, belong to the knowledge production leaders' group. This indicates that these countries lack effective mechanisms to transform the outputs of KPP into innovation products and new technologies. The good performance of KPP in these countries is associated with low performance in commercializing the outputs of KPP. Therefore, BRICS economies need to focus their efforts on building enablers and bridging relationships between universities and industry by supporting intermediary firms and intermediary actors. These intermediary actors are considered a key element in increasing synergy among NIS's actors and facilitating the flow of knowledge, practices and technologies among them.
Regarding the foreign investment-related policies, BRICS countries need to promote free markets and free trade and build the legal and institutional environment that stimulates the influx of foreign companies involved in innovation, not just those looking for low wage labour.
In this context, it should be mentioned that the weak link between the KPP and KCP can by caused by many other economic, political and cultural factors. For instance, Krasikova and Ognev (2014) showed that corruption in the innovation activities of universities reduces the productive interactions of them with business sector and government. In the same context, Lobazova (2019) emphasized the role of mentality of corruption as a factor hampering innovation. On the other hand, other studies addressed the direct negative influence of political instability on the innovation system (Allard et al., 2012;Namazi & Mohammadi, 2018;Pertuze Salas et al., 2019).
Regarding the political economy of the way in which the innovation system works, it can be said that the lack of institutional capacities and the weak role of the low play a decisive role in shifting the innovation strategies of the main actors in the innovation system from a partnership strategies to a lobby or corruption strategies (Fagerberg et al., 2009;Gao & Yuan, 2020;Papaioannou et al., 2016). In consistence with the results of our study, we argue that most of BRICS countries suffer from the hindering effects of all previous environmental factors. These factors play an important role in shaping the political economy of innovation in this group of countries.
The aforementioned policies should coincide with a strong presence of government as a key coordinating actor in the innovation system whose main task is to stimulate entrepreneurial activities, effectively manage productive innovation relationships and create incentives for these types of activities.
The results of DEA show that some countries have a good total efficiency score, but they have low-efficiency scores in KPP or KCP. On the other hand, other countries such as BRICS countries have a low total efficiency score combined with high efficiency score of KPP and low efficiency score of KCP. Therefore, in Table 8, we conducted a correlation analysis between the total efficiency score and the two other sub-processes scores. Table 8 shows that the total innovation performance of studied NISs depends more on the commercialization process of scientific and technical knowledge than on the knowledge production process. The correlation matrix also shows that there is a relationship between the total innovation performance and the KPP performance; however, this relationship is not significant enough to claim a causal relationship between these two processes.
Table 8 also shows that the relationship between KPP efficiency score and KCP efficiency score is positive but insignificant. Besides, results in Table 6 show that in most of the studied NISs the performance of KPP is better than the performance of KCP. This means that at some point, any increase in investments in KPP would cause a decrease in the KCP performance. All BRICS economies are good cases of such phenomenon. This result confirms our choice of the input-oriented model for the knowledge production process, as efficiently managing the inputs of this process would reduce the opportunity cost of investing in commercial exploitation of knowledge at the national level.
Considering that all BRICS economies have low performance in commercializing their scientific and technical knowledge. It is important to mention that improving the commercialization of scientific and technical knowledge alone will not improve the national innovation performance of the BRICS countries, where innovation is not only technical know-how but also a socio-economic phenomenon. In this context, it is worth noting that most BRICS countries lack a national innovation paradigm. Previous studies (Miravitlles et al., 2017;Wang & Li-Ying, 2014) have shown that these countries tend to imitate foreign technological models rather than developing a local model based on local capabilities. In addition, most of BRICS countries suffer from the problem of translating technological developments into improvements in social and economic conditions. This makes governments lack the resources, expertise and legitimacy to develop a national innovation industrial behaviour.

Limitations
The introduced framework analysis of DEA is a one-way path, where it does not consider the other innovation channels that contribute to the national innovation performance such as social innovation and the spillovers of other innovation agents' interactions. Moreover, we think that studying the impact of the political economy related factors such as political system, and corruption on the total performance of innovation system would provide a different research perspective in the innovation studies. So, considering these other research aspects of innovation system in future studies is a good scope for other scholars to study.

Conclusion
In this study, an assessment of the BRICS NISs was conducted based on a biascorrected network DEA. The national innovation process of NIS was divided into two sub-processes: knowledge production process and knowledge commercialization process. In doing so, we have bridged the research gap in the existing literature that used to deal with the innovation system as a one process leading to misleading results. The results showed that BRICS NISs suffer from low performance in commercializing their outputs of universities and research organizations. On the other hand, their performance in creating scientific and technical knowledge is good in comparison to other studied countries. We suggest that the reason behind this imbalance is the network system failure associated with weak institutions and high uncertainty in the economy.
Moreover, based on the projection analysis and correlation matrix analysis of DEA results, we suggest that in order to improve the national innovation performance of the BRICS countries, they need to do the following measures: A. Shrinking the investment in the KPP inputs and focusing on adopting new management methods that reduce the cost opportunity of investing in the KCP. B. Building enablers and bridging organizations with a good institutional framework is a prerequisite of an efficient and productive relationship between the main NIS's actors. C. A strong presence of government as a coordinator and a rules-maker at the national level is needed in BRICS economies that have a long history and experience in central planning. D. Economic openness, well-structured and equipped technology clusters and clear definition of intellectual property rights are decisive elements in stimulating national and foreign investment and building sound industrial policy. With these conditions, MNCs will have the incentive to launch innovation-related businesses in BRICS countries. Consequently, the local industry will be able to absorb advanced technology and practices through interactive learning. E. Building an international science, technology and innovation (STI) collaboration framework among BRICS countries helps in (1) accessing to advanced scientific and technical knowledge, (2) faster exchanging and transferring knowledge and practices and (3) developing human resources in the field of science and technology (Sokolov et al., 2019).
All the above measures are directed at improving the performance of the commercialization process of knowledge in BRICS economies in order to improve their NISs. However, we argue that building a good NIS does not necessarily mean improving the national economic and social conditions automatically, evidence from the Indian case support this argument. Technological developments must be translated into improvements in the standard of living of citizens and lead to building a free and open knowledge society, which is an important prerequisite for sustaining innovation-based economic growth. Finally, we suggest that studying the political economy of the innovation system in the future studies will provide more insights to the policymakers. So, they will be able to understand the interactions among the actors in the system and direct their innovation policies and strategies towards establishing highly synergetic relationships and more efficient innovative activities. • Employment in knowledgeintensive activities (manufacturing and services) as % of total employment. • Medium and high-tech product exports as % total product exports. • Knowledge-intensive services exports as % total service exports.
• Export of high -tech products. • GDP of employment (The ratio of gross domestic product (GDP) to total employment in the economy).
• External patents by resident.
• Patents by a country's residents. • National productivity.  • Patent per million.
• Human capital and research.
• Scientific and technical articles.
• Higher Education Expenditure on R&D.
• Labour force with tertiary education. Zhao et al., 2015 Ordinal Multidimensional Scaling and Cluster analysis -Wang, Zhao, & Zhang, 2016 The time lags effects of innovation input on output in the NISs • Researchers in R&D (per million people).
• University-industry research collaboration.

Sesay et al., 2018
Dynamic Panel Data Analysis NIS ➔ Economic Growth • University enrolment rate for science and engineering students. • government research and development expenditure.  • Total public education expenditure.
• Population with tertiary education per 100 population aged. • Doctorate graduates per 1000 population aged.
• Total tax rate.
• Number of procedures required to start a business.
• Employment in knowledge intensive services (% of workforce).