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Economic Theories

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Contemporary Theories

Summary of Solow model * Convergence because high returns to capital at low levels of capital * When capital stock is low, huge positive returns to capital but this is not true at very high levels of capital. * Less and less returns at high level of capital * Growth comes naturally from perfect competitive markets * There is no need to do anything. If you are on the left hand side of k*, the economy will grow. * True only for perfect competitive markets meaning * If needed human capital is available at any scale and quantity (no role for human capital in the Solow model though because we always divide everything by population) * There is a possibility of technology transfer * Government provides essential services * No need for development policy * Because again a country grows naturally if it’s on the left of k* and all countries converge to the same point

But no evidence of convergence * Regressions: yes, but shaky * There was evidence of regressions, initial wealth was negatively related to GDP growth but we saw that the regressions were subject to many problems like OVB, reverse causality * Historical growth 1960-1990 * World: 1.7% (double after 43 years) * East Asia: 3.3% (double after 23 years) * South Asia: 1.9% (double after 38 years) * Sub-Saharan Africa: 0.2% (double after 348 years)

Difference between OECD and rest of the world: * Convergence in graph b (OECD sample). Low initial wealth, high growth rate. * But in the rest of the world, there is no convergence or negative relationship between initial wealth and GDP growth. Rather, there is a positive relationship meaning the richer you are, the higher your growth rates.

Growth Convergence and Absolute Income Divergence * There can be convergence in growth rates but

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