This paper analyses the links between growth and public capital for a sample of 28 developing countries over eleven years (1981-91). We estimate a simultaneous equations model to explain the GDP, as well as public and private capital formation. Public, private and human capital are positive and significant factors of growth. Nevertheless, public capital formation has produced crowding-out effects, since the budget constraint was differentiated between public and private sectors. Our results suggest that the majority of the sample countries tended rather to diverge from the optimal allocation of capital — in terms of growth — between public and private sectors ...