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Cross-country regression analysis is applied to thirty-four countries for the 1950s and fifty-one countries for the 1960s. When foreign aid, foreign investment, other inflows and domestic savings are treated as separate independent variables: (a) savings and foreign inflows explain over a third of growth; (b) foreign aid has a substantially greater effect than the other variables; (c) correlation between aid and foreign private investment is not significant; (d) only for Asia do the four variables explain much; and (e) growth is not correlated with exports, education, per capita income, or country size. Savings are highly correlated with exports and per capita income, not with country size.
Gustav F. Papanek (Mon,) studied this question.