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We find a strong relationship between risk-loving preferences and cognitive ability which becomes stronger as adherence to the generalized axiom of revealed preference (a proxy for rationality) increases. Our results are taken from a field study of individuals at the very bottom of the income distribution in a developing nation. Our results for some of the poorest in the world support recent findings drawn from subjects in wealthy Western nations, suggesting there may be a stable relationship between risk preferences and cognitive ability for the human population as a whole irrespective of socio-economic status.