Democracy, Economic Development, and Income Inequality
研究发现，民主经验年限越长，收入不平等程度越低；收入不平等程度越高，民主政权越不稳定。经济发展对民主稳定无直接影响。
Most cross-national tests of inverse association between democracy and inequality have operationalized the concept of democracy by measuring its level at a single point in time. More compelling theoretical arguments can be made for causal relationships that operate over time between (1) a country's years of democratic experience and income inequality; and (2) income inequality and the stability of democracy. Continuous and qualitative measures of years of democratic experience are estimated to have a significant negative impact on income inequality independent of economic development and other control variables for a sample of 55 countries. A very strong inverse correlation is also observed between income inequality and regime stability for a sample of 33 democracies. This association holds independent of economic development, which is found to have no direct effect on democratic stability after controlling for income inequality.