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Journal of Economic Perspectives- Volume Number1- Winter1994-pages 23-44 8,

Endogenous Innovation in the Theory of Growth

Gene M. Grossman and Elhanan Helpman

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an economic growth be sustained in the long run? If so, what deter-

mines the long-run rate of growth? Which economies will grow the fastest? And what kinds of policies can governments use to accelerate advances in living standards? These questions were central for those who studied growth in the 1950s and 1960s, and remain so in the recent revival of interest in long-run economic performance. Two observations have motivated many of the recent contributors to growth theory. First, output expansion has outpaced population growth in the 200 years since the industrial revolution. Second, different countries have remained on seemingly disparate growth paths for relatively long periods of time. Related to this second observation is another: in cross-section and timeseries data, we find national and regional growth rates correlated with a variety of economic, social, and political variables, including many that are affected by government policies. These observations have led the current generation of growth theorists to formulate models in which per capita income grows indefinitely and long-run performance reflects structural and policy parameters of the local and global economy. With this apparent similarity of intentions, recent research efforts have headed in several different directions. One strand of theory continues to see capital accumulation-though conceivably with a broad interpretation of that includes human capital-as the driving force behind economic "capital" * Gene M. Grossman is the Jacob R. Viner Professor of International Economics, Princeton University,Princeton, New Jersey. Elhanan Helpman is the Archie Sherman Professor of International Economic Relations, Tel Aviv University, Tel

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