Abstract
Traditional research shows that a retailer suffers a loss due to information sharing with a manufacturer in a supply chain. However, when the manufacturer produces both new and remanufactured products, the retailer’s trade-offs change. This paper investigates whether the retailer can share demand information with the manufacturer if they can add remanufactured products to the product line. We reveal that the retailer can benefit from information sharing when the manufacturer may remanufacture. On the one hand, if the retailer shares information, the manufacturer utilizes information to strategically adjust wholesale prices, resulting in a reduction in the retailer’s profit. On the other hand, if the retailer does not share the information, the manufacturer abandons remanufacturing, leading to a lower profit for the retailer. Therefore, when the former loss is less than the latter, the retailer is willing to share information with the manufacturer. Furthermore, we find that remanufacturing and information sharing can achieve a triple-win situation for the retailer, the manufacturer and the environment.
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Notes
See the following report on Cash for Cartridges: https://www.cashforcartridges.co.uk/news-category/the-impact-of-ink-cartridges-on-the-environment.
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Acknowledgements
This work was partially supported by the National Science Foundation of China (Nos. 71672153, 61876157, 71571148), the Chuying Scholar Plan (Part A) of SWJTU and the Yanghua Scholar Plan (Part A) of SWJTU.
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Appendices
Appendix A: Proofs
For ease of exposition, we define
Proof of Proposition 1 First, we solve the equilibrium solution of remanufacturing or no remanufacturing without information sharing.
No remanufacturing Given that R does not share demand information, if M does not remanufacture, the profit function of R is
Given the wholesale price \(w_{n}\), R’s optimal order quantity is
Without demand information, M uses expected value \({\text{E}}\left[ \varepsilon \right]\) to anticipate R’s optimal order quantity. Thus, the problem of M under no information sharing and no remanufacturing is
As \(\varepsilon \sim U\left[ {0,1} \right]\), we have \({\text{E}}\left[ \varepsilon \right] = {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\). The optimal wholesale price of the new product is
By substituting the optimal wholesale price into R’s order quantity response function, we write the optimal ex post order quantity as
Let \(c \le {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\) to guarantee \(q_{n}^{{NN}} \ge 0\). The ex post optimal profits are \(\pi _{M}^{{NN}} = 0\) and \(\pi _{R}^{{NN}} = 0\), and the ex ante profits of M and R are
Remanufacturing Given that R does not share demand information, if M remanufactures, the profit function of R is
Given the wholesale price \(w_{n}\) of the new product and the wholesale price \(w_{r}\) of the remanufactured product, R’s optimal order quantities of each product are
Without demand information, M uses expected demand value \({\text{E(}}\varepsilon )\) to anticipate R’s optimal order quantities of each product. Hence, the problem of M can be written as
The optimal wholesale prices of the new product and remanufactured product are
By substituting the wholesale prices into R’s order quantity response functions, we obtain the optimal ex post optimal order quantities of each product as
and
where \(\varepsilon _{0} = {{\left( {4x - \left( {1 - b} \right) - 2\left( {1 - c} \right)\left( {1 + b} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {4x - \left( {1 - b} \right) - 2\left( {1 - c} \right)\left( {1 + b} \right)} \right)} {\left( {4\left( {1 - b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {4\left( {1 - b} \right)} \right)}}\). Let \(c \le 1 - x\) to guarantee \(q_{n}^{{NR}} \ge q_{r}^{{NR}}\).
Thus, if \(\varepsilon \le \varepsilon _{0} ,q_{r}^{{NR}} = 0.\) The ex post optimal profits of M and R are \(\pi _{M}^{{NR}} = \pi _{M}^{{NR1}}\) and \(\pi _{R}^{{NR}} = \pi _{R}^{{NR1}}\). If \(\varepsilon > \varepsilon _{0} ,q_{r}^{{NR}} > 0.\) The ex post optimal profits of M and R are \(\pi _{M}^{{NR}} = \pi _{M}^{{NR2}}\) and \(\pi _{R}^{{NR}} = \pi _{R}^{{NR2}}\).
Next, we calculate the ex ante profits of M and R. If \(c \le {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}},\varepsilon _{0} > 1,q_{r}^{{NR}} = 0\) always holds in the feasible region, and the ex ante profits of M and R are
If \({{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}},q_{r}^{{NR}} > 0\) when \(\varepsilon > \varepsilon _{0}\). The corresponding ex ante profits of M and R are
where \(\kappa _{0} = 2bc - 5b + 2c + 4x + 1\). If \(c > {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), the corresponding ex ante profits of the manufacturer and the retailer are
As a result, we have
We analyze M’s remanufacturing strategy by comparing the optimal profits under remanufacturing and no remanufacturing.
-
1.
If \(c \le {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
$$\Pi _{M}^{{NR}} - \Pi _{M}^{{NN}} = - F.$$Let \(F_{1}^{N} = 0\). \(\Pi _{M}^{{NR}} \le \Pi _{M}^{{NN}}\) if \(F \ge F_{1}^{N}\). Thus, M never remanufactures in this case.
-
2.
If \({{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
$$ \Pi _{M}^{{NR}} - \Pi _{M}^{{NN}} = \frac{{\left( {2bc - 3b + 2c + 4x - 1} \right)\left( {2bc - 5b + 2c + 4x + 1} \right)^{2} }}{{256\left( {b + 3} \right)\left( {1 - b} \right)^{2} }} - F. $$Let
$$ F_{2}^{N} = \frac{{\left( {2bc - 3b + 2c + 4x - 1} \right)\left( {2bc - 5b + 2c + 4x + 1} \right)^{2} }}{{256\left( {b + 3} \right)\left( {1 - b} \right)^{2} }}. $$
Then, \(\Pi _{M}^{{NR}} > \Pi _{M}^{{NN}}\) and \(F < F_{2}^{N}\), and M remanufactures; otherwise, \(\Pi _{M}^{{NR}} \le \Pi _{M}^{{NN}}\), and M never remanufactures.
(3) If \(c > {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
Let.
Then, \(\Pi _{M}^{{NR}} > \Pi _{M}^{{NN}}\) and \(F < F_{3}^{N}\), and M remanufactures; otherwise, \(\Pi _{M}^{{NR}} \le \Pi _{M}^{{NN}}\), and M never remanufactures. Define
Thus, M remanufactures if and only if \(F \le \Omega _{N}\).
Proof of Proposition 2 We solve the equilibrium of remanufacturing and no remanufacturing with information sharing.
No remanufacturing Given that R shares demand information, if M does not remanufacture, the profit function of R is
Given wholesale price \(w_{n}\), R’s optimal order quantity is
With demand information, the problem of M for the case with no remanufacturing is
The optimal wholesale price of the new product is
By substituting the optimal wholesale price into R’s order quantity response function, we write the optimal ex post optimal order quantity as
Obviously, \(q_{n}^{{IN}} > 0\), and the ex post optimal profits of M and R are
and
The ex ante profits of M and R are
\(\Pi _{M}^{{IN}} = \int_{0}^{1} {\frac{{\left( {1 + \varepsilon - c} \right)^{2} }}{8}d\varepsilon = } \frac{{3c^{2} - 9c + 7}}{{24}}\) and \(\Pi _{R}^{{IN}} = \int_{0}^{1} {\frac{{\left( {1 + \varepsilon - c} \right)^{2} }}{{16}}d\varepsilon = } \frac{{3c^{2} - 9c + {\text{7}}}}{{48}}.\)
Remanufacturing Given that R shares demand information, if M remanufactures, the profit function of R is
Given the wholesale price \(w_{n}\) of the new product and the wholesale price \(w_{r}\) of the remanufactured product, R’ optimal order quantities are
With demand information, the problem of M can be written as
The optimal wholesale price of the new product and the remanufactured product is as follows.
By substituting the optimal wholesale prices into R’s order quantity response functions, we write the optimal ex post optimal order quantities as
and
where \(\varepsilon _{1} = {{\left( {4x - \left( {1 - b} \right) - 2\left( {1 - c} \right)\left( {1 + b} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {4x - \left( {1 - b} \right) - 2\left( {1 - c} \right)\left( {1 + b} \right)} \right)} {\left( {4\left( {1 - b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {4\left( {1 - b} \right)} \right)}}\). If \(\varepsilon \le \varepsilon _{1}\), the ex post optimal profits of M and R are \(\pi _{M}^{{IR}} = \pi _{M}^{{IR1}}\) and \(\pi _{R}^{{IR}} = \pi _{R}^{{IR1}}\), respectively. If \(\varepsilon > \varepsilon _{1}\), the ex post optimal profits of M and R are \(\pi _{M}^{{IR}} = \pi _{M}^{{IR2}}\) and \(\pi _{R}^{{IR}} = \pi _{R}^{{IR2}}\), respectively.
Next, we solve the ex ante profits of M and R. If \(c \le {{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), \(\varepsilon _{1} > 1\), which indicates that \(q_{r}^{{IR}} = 0\) always holds and the ex ante profits of M and R are
If \({{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), \(q_{n}^{{IR}} = 0\) only when \(\varepsilon \le \varepsilon _{1}\). The corresponding ex ante profits of M and R are
where \(\kappa _{1} = bc - 2b + c + 2x\). If \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le \bar{c}\), the corresponding ex ante profits of M and R are
As a result, we have
Similar to that shown by the proof of Proposition 8, we find that M remanufactures if and only if \(F \le \Omega _{I}\).
Proof of Proposition 3 As \(\Omega _{N} \le \Omega _{I}\), we analyze R’s optimal information sharing decision for the scenarios of \(F \le \Omega _{N}\), \(F > \Omega _{I}\) and \(\Omega _{N} < F \le \Omega _{I}\).
Scenario 1 When \(F \le \Omega _{N}\), regardless of whether R shares demand information, M will always remanufacture. In anticipating M’s decision, R makes the information sharing decision by comparing her optimal ex ante profits from information sharing and no information sharing.
-
(1.1)
If \(c \le {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), \(\Pi _{R}^{{IR}} - \Pi _{R}^{{NR}} = - {1 \mathord{\left/ {\vphantom {1 {64}}} \right. \kern-\nulldelimiterspace} {64}}\). Obviously, \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NR}}\). Thus, R does not share information in this case.
-
(1.2)
If \({{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le {{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we assume that \(f_{1} \left( c \right) = \Pi _{R}^{{IR}} - \Pi _{R}^{{NR}}\). As \(f^{\prime}_{1} \left( c \right) < 0\) and \(f_{1} \left( {c = {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}} \right) < 0\), \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NR}}\) and R do not share information in this case.
-
(1.3)
If \({{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we have \(f^{\prime}_{1} \left( c \right) < 0\) and \(f_{1} \left( {c = {{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}} \right) < 0\). Thus, \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NR}}\), and R does not share information in this case.
-
(1.4)
If \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} \le c < {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
$$ \Pi _{R}^{{IR}} - \Pi _{R}^{{NR}} = - \frac{{\left( {1 + b} \right)\left( {2bc - b + 2c + 4x - 3} \right)^{2} }}{{128\left( {3 + b} \right)\left( {1 - b} \right)^{2} }} $$Obviously, and R do not share information in this case.
-
(1.5)
If, \( (b - 4x + 3)/(2(1 + b)) \le c < \bar{c} \) we have
$$ \Pi _{R}^{{IR}} - \Pi _{R}^{{NR}} = \frac{{2bx + b + 4c + 2x - 5}}{{8\left( {b + 3} \right)\left( {1 - b} \right)}}. $$
Thus, \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NR}}\) and R do not share information in this case. Consequently, R never shares information when \(F \le \Omega _{N}\).
Scenario 2 When \(F > \Omega _{I}\), similar to that shown by the proof of, we can obtain \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NR}}\). Thus, R never shares information when.
Scenario 3 When, M’s remanufacturing strategy depends on R’s information sharing decision. Specifically, M remanufactures if R shares demand information, while M does not remanufacture if R does not share information. In anticipating M’s reaction, R makes her demand information sharing decision. Next, we determine R’s best information sharing strategy by comparing her equilibrium profits with and without information sharing.
-
3.1
If \(c \le {{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we have \(\Pi _{R}^{{IR}} = \Pi _{R}^{{NN}}\) and R does not share demand information.
-
3.2
If \({{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we have
$$ \begin{gathered} \Pi _{R}^{{IR}} - \Pi _{R}^{{NN}} = \frac{{4\left( {1 + b} \right)^{3} c^{3} - 35b^{3} + 32x^{3} - 3b^{2} + 15b - 9}}{{192\left( {3 + b} \right)\left( {1 - b} \right)^{2} }} \hfill \\ {\text{ }} - \frac{{24\left( {b - x} \right)\left( {bc - 2b + c} \right)\left( {bc + c + 2x} \right)}}{{192\left( {3 + b} \right)\left( {1 - b} \right)^{2} }}. \hfill \\ \end{gathered} $$When \(f_{2} \left( c \right) = \Pi _{R}^{{IR}} - \Pi _{R}^{{NN}}\), we have \(f_{1} \left( {c = {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}} \right) > 0\) and \(f_{2} \left( c \right) > 0\) when \({{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\). Thus, we have \(\Pi _{R}^{{IR}} < \Pi _{R}^{{NN}}\), and R does not share demand information in this case.
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3.3
If \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le \bar{c}\), we have
$$ \begin{gathered} \Pi _{R}^{{IR}} - \Pi _{R}^{{NR}} = \frac{{12c\left( {1 + b} \right)\left( {bc - 3b + c + 4x - 1} \right)}}{{192\left( {b + 3} \right)\left( {1 - b} \right)}} \hfill \\ {\text{ }} + \frac{{31b^{2} + 22b - 24x\left( {3b - 2x - 1} \right) - 5}}{{192\left( {b + 3} \right)\left( {1 - b} \right)}}. \hfill \\ \end{gathered} $$
By solving \(\Pi _{R}^{{IR}} - \Pi _{R}^{{NR}} = 0\) for \(c\), we have
We have \(\Pi _{R}^{{IR}} \le \Pi _{R}^{{NN}}\) when \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le \tau _{0}\) and \(\Pi _{R}^{{IR}} > \Pi _{R}^{{NN}}\) when \(\tau _{0} < c < \bar{c}\).
By combining all of the results of scenario 3, R shares information only when \(\Omega _{1} < F \le \Omega _{2}\) and \(\tau _{0} < c < \bar{c}\).
Proof of Proposition 5 We calculate the ex ante total environmental impact in the equilibrium of each case as follows:
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Case 1 In equilibrium NN, the ex ante expected environmental impact is
$$E^{{NN}} = \int_{0}^{1} {q_{n}^{{NN}} } d\varepsilon = \frac{3}{8} - \frac{c}{4}$$ -
Case 2 In equilibrium NR, if \(c \le {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
$$E^{{NR}} = \int_{0}^{1} {q_{n}^{{NR}} } d\varepsilon = \frac{3}{8} - \frac{c}{4}.$$If \({{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le {{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have
$$E^{{NR}} = \int_{0}^{1} {q_{n}^{{NR}} } d\varepsilon + \delta \left( {\int_{0}^{{\varepsilon _{0} }} 0 d\varepsilon + \int_{{\varepsilon _{0} }}^{1} {q_{r}^{{NR}} } d\varepsilon } \right) = \frac{{\kappa _{0} ^{2} \left( {2b\delta + 2b + 6\delta + 3} \right) + 8\left( {1 - b} \right)^{2} \left( {3 - 2c} \right)}}{{64\left( {1 - b} \right)^{2} }}.$$If \({{\left( {b - 4x + 3} \right)} \mathord{\left/ {\vphantom {{\left( {b - 4x + 3} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le \bar{c}\), we have
$$E^{{NR}} = \int_{0}^{1} {q_{n}^{{NR}} } d\varepsilon + \delta \int_{0}^{1} {q_{r}^{{NR}} } d\varepsilon = \frac{{\left( {\kappa _{0} + 2b - 2} \right)\delta + 5 - b - 4c - 2x\left( {1 + b} \right)}}{{4\left( {3 + b} \right)\left( {1 - b} \right)}}.$$ -
Case 3 In equilibrium IN, we have
$$E^{{IN}} = \int_{0}^{1} {q_{n}^{{IN}} } d\varepsilon = \frac{3}{8} - \frac{c}{4}$$ -
Case 4 In equilibrium IR: If \(c \le {{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we have
$$E^{{IR}} = \int_{0}^{1} {q_{n}^{{IR}} } d\varepsilon = \frac{3}{8} - \frac{c}{4}.$$If \({{\left( {2\left( {b - x} \right)} \right)} \mathord{\left/ {\vphantom {{\left( {2\left( {b - x} \right)} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\), we have
$$E^{{IR}} = \int_{0}^{1} {q_{n}^{{IR}} } d\varepsilon + \delta \left( {\int_{0}^{{\varepsilon _{1} }} 0 d\varepsilon + \int_{{\varepsilon _{1} }}^{1} {q_{r}^{{IR}} } d\varepsilon } \right) = \frac{{\left( {3 + b + \kappa _{{\text{0}}} - 4x - 4c} \right)}}{{8\left( {1 - b} \right)}}$$If \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le \bar{c}\), we have
$$E^{{IR}} = \int_{0}^{1} {q_{n}^{{IR}} } d\varepsilon + \delta \int_{0}^{1} {q_{r}^{{IR}} } d\varepsilon = \frac{{\left( {2\kappa _{{\text{0}}} + b - 1} \right)\delta + 5 - b - 4c - 2x\left( {1 + b} \right)}}{{4\left( {b + 3} \right)\left( {1 - b} \right)}}.$$
Next, we compare the environmental impact of each equilibrium to benchmark NN.
Scenario 1 \(F \le \Omega _{1}\):
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If \(c \le {{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}}\), we have \(E^{{IR}} = E^{{NN}}\).
-
If \({{\left( {5b - 4x - 1} \right)} \mathord{\left/ {\vphantom {{\left( {5b - 4x - 1} \right)} {\left( {2\left( {1 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\left( {1 + b} \right)} \right)}} < c \le {{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}}\delta \le {{\left( {1 + b} \right)} \mathord{\left/ {\vphantom {{\left( {1 + b} \right)} 2}} \right. \kern-\nulldelimiterspace} 2}\), we have \(E^{{IR}} - E^{{NN}} = \frac{{\left( {2\delta - \left( {1 + b} \right)} \right)\left( {2bc - 5b + 2c + 3} \right)^{2} }}{{64\left( {3 + b} \right)\left( {1 - b} \right)^{2} }}\)
Obviously, \(E^{{IR}} \le E^{{NN}}\) when \(\delta \le {{\left( {1 + b} \right)} \mathord{\left/ {\vphantom {{\left( {1 + b} \right)} 2}} \right. \kern-\nulldelimiterspace} 2}\) and \(E^{{IR}} > E^{{NN}}\) when \(\delta > {{ = \left( {1 + b} \right)} \mathord{\left/ {\vphantom {{ = \left( {1 + b} \right)} 2}} \right. \kern-\nulldelimiterspace} 2}\).
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If \({{\left( {b - 2x + 1} \right)} \mathord{\left/ {\vphantom {{\left( {b - 2x + 1} \right)} {\left( {1 + b} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {1 + b} \right)}} < c \le \bar{c}\), we have
$$E^{{NR}} - E^{{NN}} = \frac{{\left( {2\delta - \left( {1 + b} \right)} \right)\left( {2bc - 3b + 2c + 1} \right)}}{{8\left( {b + 3} \right)\left( {1 - b} \right)}}$$
Hence, \(E^{{IR}} \le E^{{NN}}\) when \(\delta \le {{\left( {1 + b} \right)} \mathord{\left/ {\vphantom {{\left( {1 + b} \right)} 2}} \right. \kern-\nulldelimiterspace} 2}\) and \(E^{{IR}} > E^{{NN}}\) when \(\delta > {{ = \left( {1 + b} \right)} \mathord{\left/ {\vphantom {{ = \left( {1 + b} \right)} 2}} \right. \kern-\nulldelimiterspace} 2}\).
Similarly, the proofs for when \(\Omega _{1} < F \le \Omega _{2}\) and \(F > \Omega _{2}\) are similar to the proof for when \(F \le \Omega _{1}\). We do not include the proofs to save space.
Proof of Proposition 6 By relaxing the constraint of \(c < \min \left\{ {{1 \mathord{\left/ {\vphantom {1 {2,1 - x}}} \right. \kern-\nulldelimiterspace} {2,1 - x}}} \right\}\), we have
When \(c \le {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\), the ex ante profits of M and R are
When \(c > {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\), the ex ante profits of M and R are
Next, we consider the cases of NR and IR with constraint \(q_{r} = q_{n}\). Similar to proofs of the previous problem, we obtain the optimal production quantities for the case of NR as
The ex ante profits of M and R are written as
Unlike in the case with no remanufacturing, M remanufactures when \(\tilde{\Pi }_{M}^{{NR}} < \tilde{\Pi }_{M}^{{NN}}\). Let \(F = \Phi _{N}\) be \(\tilde{q}_{r} = \tilde{q}_{n}\) the unique solution of \(g_{1} (F) = 0\) where \(g_{1} (F) = \tilde{\Pi }_{M}^{{NR}} - \tilde{\Pi }_{M}^{{NN}}\). Thus, M remanufactures when \(0 < F \le \Phi _{N}\). With information, if M remanufactures under the constraint of, the optimal production quantities are \(\tilde{q}_{n}^{{IR}} = \tilde{q}_{r}^{{IR}} = {{\left( {1 + x + 2\varepsilon - c} \right)} \mathord{\left/ {\vphantom {{\left( {1 + x + 2\varepsilon - c} \right)} {\left( {4\left( {3 + b} \right)} \right)}}} \right. \kern-\nulldelimiterspace} {\left( {4\left( {3 + b} \right)} \right)}}\). The expect profits of M and R are
Let \(F = \Phi _{I}\) be the unique solution of \(g_{2} (F) = 0\), where \(g_{2} (F) = \tilde{\Pi }_{M}^{{IR}} - \tilde{\Pi }_{M}^{{IN}}\). M remanufactures when \(0 < F \le \Phi _{I}\). As \(\Phi _{N} < \Phi _{I}\), M always remanufactures when \(F \le \Phi _{N}\) and never remanufactures when \(F > \Phi _{I}\) regardless of whether R shares her information. When \(\max \left\{ {\Phi _{N} ,0} \right\} < F \le \Phi _{I}\), M remanufactures if R shares demand information and does not without demand information. In anticipating M’s reaction, R makes her information sharing decision by comparing her optimal profits from cases \(IR\) and \(NN\). First, if \(c \le {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\), then
By solving \(\tilde{\Pi }_{R}^{{IR}} - \tilde{\Pi }_{R}^{{NN}} = 0\) for c, we obtain the feasible solution as
If \(c > {1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}\), then
Let \(f_{3} \left( c \right) = \tilde{\Pi }_{R}^{{IR}} - \tilde{\Pi }_{R}^{{NN}}\) and \(l^{\prime\prime}_{1}\) be the unique solution of \(f_{3} \left( c \right) = 0\) for the feasible region. Assume that
We have \(\tilde{\Pi }_{R}^{{IR}} > \tilde{\Pi }_{R}^{{NN}}\) if \(c > l_{1}\) and \(\tilde{\Pi }_{R}^{{IR}} \le \tilde{\Pi }_{R}^{{NN}}\) if \(c \le l_{1}\). Hence, R shares demand information with M when \(\max \left\{ {\Phi _{N} ,0} \right\} < F \le \Phi _{I}\) and \(c > l_{1}\).
Appendix B: Additional Analysis
In the main body of the paper, we do not consider constraint \(q_{r} \le q_{n}\). In Appendix B, we incorsporate the constraint into our model. Thus, the model uses nonlinear programming. We use KKT conditions to solve the nonlinear programming problem. Due to the complexity of nonlinear programming, we conduct a numerical study to present the results and demonstrate the validity of our main results.
In the following, we show the retailer’s information sharing decision in Fig.
7. Then, we examine the economic impacts of remanufacturing and information sharing on the manufacturer and retailer in Fig.
8. Finally, we explore the environmental impact of remanufacturing and information sharing on the environment.
Figure 7 shows that the retailer’s decision does not change when taking constraint \(q_{r} \le q_{n}\) into consideration. We find that the retailer shares her information with the manufacturer if and only if the fixed remanufacturing cost is moderate and the remanufacturing cost savings are high.
As shown in Figure 8, when the manufacturer chooses to remanufacture, this always creates win-win outcomes. When the manufacturer abandons remanufacturing, no impact occurs. The results are same as those outlined in Proposition 4.
As shown in Figure
9, intuitively, when the manufacturer does not remanufacture, there is no impact on the environment. When the manufacturer embraces remanufacturing, the environment may improve or worsen depending on the environmental saving parameter. The results are quite similar to those outlined in Proposition 10.
Appendix C: Two-Period Model
In the main model, we explore the retailer’s information strategy adopted within a single period. Next, we introduce a two-period model to examine whether the retailer’s information strategy obtained from our main model still holds. In the model, the manufacturer produces only new products in the first period, but he may make new products and remanufactured products in the second period. The new product price in the first period is, \(p_{1} \left( {q_{1} } \right) = 1 + \varepsilon - q_{1}\), and the prices of new and remanufactured products in the second period are \(p_{n} \left( {q_{n} ,q_{r} } \right) = 1 + \varepsilon - q_{n} - bq_{r}\) and \(p_{r} \left( {q_{n} ,q_{r} } \right) = x + \varepsilon - q_{r} - q_{n}\), respectively. We assume that the production cost of the new product is not too high, i.e., \(c \le \left\{ {{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2},{{\left( {9 - 8{\mkern 1mu} x - b^{2} } \right)} \mathord{\left/ {\vphantom {{\left( {9 - 8{\mkern 1mu} x - b^{2} } \right)} {2{\mkern 1mu} \left( {5 - b^{2} } \right)}}} \right. \kern-\nulldelimiterspace} {2{\mkern 1mu} \left( {5 - b^{2} } \right)}}} \right\}\), so that the quantity of the new product is not equal to zero and the quantity of the remanufactured product is less than that of the new product, e.g., \(q_{r} \le q_{1}\). Under the case with \(NR\), the profit functions of the manufacturer and retailer are
where subscript \({\text{1}}\) denotes the first period, and subscripts \(n\) and \(r\) denote new and remanufactured products, respectively. For the case of \(IR\), the corresponding profit functions are
In Fig. 10, we show the retailer’s information sharing decision made over of two periods.
We find that the retailer shares her information with the manufacturer if and only if the fixed remanufacturing cost is moderate and the remanufacturing cost savings are high, which is consistent with the retailer’s information strategy obtained from the single-period model.
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Nie, J., Wang, Q., Li, G. et al. To share or not to share? When information sharing meets remanufacturing. Ann Oper Res 329, 815–846 (2023). https://doi.org/10.1007/s10479-021-04151-8
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DOI: https://doi.org/10.1007/s10479-021-04151-8