Panel and time-series data describing the green-revolution period in India are used to assess the effects of exogenous technical change on the returns to schooling, the effects of schooling on the profitability of technical change, and the effects of technical change and school availability on household schooling investment. The results indicate that the returns to (primary) schooling increased during a period of rapid technical progress, particularly in areas with the highest growth rates. Such increases induced private investment in schooling, net of changes in wealth, wages, and the availability of schools, and school expansion importantly increased levels of schooling. Copyright 1996 by American Economic Association.
Zvi Griliches, a world-renowned pioneer in the field of productivity growth, has compiled in a single volume his pathbreaking research on R&D and productivity. Griliches addresses the relationship between research and development (R&D) and productivity, one of the most complex yet vital issues in today's business world. Using econometric techniques, he establishes this connection and measures its magnitude for firm-, industry-, and economy-level data. Griliches began his studies of productivity growth during the 1950s, adding a variable of "knowledge stock" to traditional production function models, and his work has served as the point of departure for much of the research into R&D and productivity. This collection of essays documents both Griliches's distinguished career as well as the history of this line of thought. As inputs into production increasingly taking the form of "intellectual capital" and new technologies that are not as easily measured as traditional labor and capital, the methods Griliches has refined and applied to R&D become crucial to understanding today's economy.
Grossman and Helpman provide a useful overview of recent analyses of innovation and growth, enriching and expanding the available formal theory in a number of important ways. They develop straightforward theoretical models that treat innovation as the outgrowth of costly investments in industrial research. Such investments respond to profit opportunities, which reflect competitive conditions in national and international product markets. Since firms in different countries race to bring out new products, growth processes are linked by international technological competition.
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Entrepreneurial human capital plays a relatively more important role in intermediate income countries, but professional human capital is relatively more abundant in richer economies. Because the return to entrepreneurship is risky, individuals devote less time to the accumulation of entrepreneurial skills and more to the accumulation of professional skills as per capita income grows. Countries that initially have too little of either entrepreneurial or professional skills may end up in a development trap. The steady state may be characterized by either too much or too little education.
Growth in this model is driven by technological change that arises from intentional investment decisions made by profit-maximizing agents. The distinguishing feature of the technology as an input is that it is not a conventional good or a public good; it is a nonrival, partially excludable good. Because of the noconvexity introduced by a nonrival good, price-taking competition cannot be supported. Instead, the equilibrium is one with monopolistic competition. The main conclusions are that the stock of human capital determines the rate of growth, that too little human capital is devoted to research in equilibrium, that integration into world markets will increase growth rates, and that a large population is not sufficient to generate growth.
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