Abstract
The modernization hypothesis attributes democracy to higher incomes. The hypothesis has been controversial with claims of no relationship or opposite causality. Using data on a large sample of countries over the period from 1995 to 2015, we show empirically that the hypothesis is valid by studying the role of diversified production and interest-group competition. Increases in income associated with production diversification foster the emergence of competing organized interest groups representing the different diversified sectors. The interest-group competition underlies democracy by restraining rent seeking for benefits that would otherwise be sought through single-decision-maker authoritarian government.
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