In particular, it was shown that the relationship between per capita GDP in 1985 and penile length evidenced an inverted U-shaped pattern. A strongly negative association between GDP growth from 1960 to 1985 and male organ was also identified. Somewhat surprisingly, male organ was a stronger determinant of economic development than country’s political regime type at the Polity IV autocracy-democracy spectrum.
Source: Tatu Westling. 2011. Male Organ and Economic Growth: Does Size Matter? Helsinki Center for Economic Research, Working Paper