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Why are some countries so rich and others so poor?
Intelligence: an introduction to the concept
Intelligence and earnings
Intelligence and further economic and social phenomena
The sociology of intelligence, earnings, and social competence
Data on variables and methods of analysis
National IQs and economic development in 81 nations
National IQs and economic development in 185 countries
Intelligence and markets as the determinants of economic development
The future of the wealth of nations
Appendix 1: The calculation of national intelligence levells
Appendix 2: Data on per capita income and economic growth in 185 countries.

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