What causes democracy?

Value change is an interesting and at the same time a problematic topic for sociology.
One of the most challenging themes today is the matter of autocracy and democracy. How change a governmental system in a country? What role dose people play in this process? What causes democracy?
Inglehart, among others, tried to answer these questions. In many of his works that come out from several waves of World Values Survey he speaks about political culture. According to Inglehart political culture has a main role and it causes democracy. Political culture insist of well-being, happiness, self-expression, life satisfaction interpersonal trust, tolerance with out groups, freedom of speech, political activism and etc. He calls this political culture ”self-expression values”. He and his collaborates argue that self-expression values conducive democracy. Self-expression values are necessarily condition for democracy but they aren’t sufficiently condition for it.
Economic development is the mean factor. With other word: Economic development > self-expression values > democracy

Without economic development there is no democracy.