Does a bad leadership style affect the growth of a country and cause economic melt down or bring hardship to people.
The style of leadership isn't the major problem but the decisions made by the leadership that makes the difference, Some countries practice autocracy, democracy, monarchy, e.t.c and are doing fine while there are others that practice it and are in a worse economic condition. If the leaders are competent and have sound economic implementations, of course it would reflect in the living conditions of the people, but if the leaders are corrupt, the country would remain stagnant and people would suffer greatly.
I understand your point, but every society has a style of leadership that is best for them. There are some countries where democracy does not suit the people, where autocracy and monarchy are better, and vice versa. In such a society, the Leader may be competent to do his job, but things wont be going perfectly for them. The role of the leader in having a good society is 70%, while the rest lies in the style of leadership.