Lynn and Vanhanen presented the alternative case that that variances between nations in economic success can be positively explained by variances between nations in:russ_watters said:the key to American economic success: optomism. The American economy is strong because optomism is part of American culture.
- National IQ
- Economic liberality
- Political liberality
- We also measured the significance of economic and political systems using data on economic freedom ratings (1997) and an index of democratization (1998). The results of multiple correlation analyses show that these two additional variables explain 10-12 percentage points of the variation in the measures of per capita income independently from national IQs. Thus, when the three explanatory variables are taken together, the explained part of variation in the measures of per capita income increases to 52-65 percent and less than half of the variation remains unexplained. Our conclusion is that differences in national intelligence provide the most powerful and fundamental explanation for the gap between rich and poor economies.