So here's a general rule of thumb that I believe in: When societies have strong institutions, the difference that one good leader can make is limited, but when you have weak institutions, then just one good leader can make or break that country.
所以我相信这条一般规律： 如果一个社会制度健全， 好的领导人所带来的改变也是有限的。 但如果一个社会制度不健全， 一个好的领导人 就能成就或（坏的领导人）毁掉一个国家。