Sources of U.S. Economic Growth in a World of Ideas
At least since 1950, the U.S.economy has benefited from increases in both educational attainment and research intensity. Such changes suggest, contrary to the conventional view, that the U.S.economy is far from its steady-state balanced growth path. This paper develops a model in which these facts are reconciled with the stability of av- erage U.S. growth rates over the last century. In the model, long-run growth is driven by the worldwide discovery of new ideas, which in turn is tied to world population growth. Nevertheless, a constant growth path can temporarily be maintained at a rate greater than the long- run rate provided research intensity and educational attainment rise steadily over time. Growth accounting with this model reveals that 30 percent of U.S. growth between 1950 and 1993 is attributable to the rise in educational attainment, 50 percent is attributable to the rise in worldwide research intensity, and only about 10 to 15percent is due to the long-run component of growth related to the increase in world population.
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