摘要: In this article I present an alternative specification of knowledge production and derive a structural econometric model with some desirable properties. provide simple less data-intensive framework for empirical studies the relationship between firm performance R&D. The main findings are as follows: (i) R&D has positive effect on performance, (ii) appropriable part capital depreciates at rate .2, (iii) there significant spillover effects across lines business within firm, (iv) spillovers in firms that belong to same interlocking group firms.