Table 2: Studies that demonstrated the effects of IQ on Income.

Lynn, et al. [12]; Rushton [13]; Lynn, et al. [14];
➢ Correlation of measured IQs of 113 nations and their per capita income was 0.68.
➢ Correlation between IQ of all the 192 nations IN the world and their per capita income was 0.60.
➢ Nations whose populations have high IQs have high per capita incomes and these enable them to provide high-quality nutrition, education and health care for their children and these in turn enhance their children's intelligence.
Templer, et al. [31]
➢ Mean IQ of 129 countries correlated with per capita income, skin color, and winter and summer temperatures, conceptualizing skin color as a multigenerational reflection of climate.
➢ The highest correlations were -0.92 (rho = 0.91) for skin color, -0.76 (rho = 0.76) for mean high winter temperature, -0.66 (rho = 0.68) for mean low winter temperature, and -0.63 (rho = 0.74) for real gross domestic product per capita.
Zagorsky [33]
➢ Tracked a large group of young United States baby boomers using national longitudinal survey (NLSY79). IQ correlated with annual income (0.3) and with net worth (0.16).
➢ Each point increase in IQ test scores raises income by between $234 and $616/year or 0.9-2.5% of PCGNP (mean 1.7%).