The authors show that economic development increases the probability that a country will undergo a transition to democracy. These results contradict the finding of Przeworski and his associates, that development causes democracy to last but not to come into existence in the first place. By dealing adequately with problems of sample selection and model specification, the authors discover that economic growth does cause nondemocracies to democratize. They show that the effect of economic development on the probability of a transition to democracy in the hundred years between the mid-nineteenth century and World War 11 was substantial, indeed, even stronger than its effect on democratic stability. They also show that, in more recent decades, some countries that developed but remained dictatorships would, because of their development, be expected to democratize in as few as three years after achieving a per capita income of $12,000 per capita.
