The cure for economically productive greed–which is the default in free market economy for all but banks–is wisdom. Work until you have enough, then stop.
The cure for Statist greed, which is intrinsically economically UNproductive and which leads to huge inequalities of outcome unrelated to performance, is more laws restricting the ativities of the State.
This is more or less the opposite of leftwing rhetoric. I want more laws to chain the State. They claim that granting power to the stae is inherently moral. No group or sociery can be moral, though, which is not composed of people who as individuals are moral.
The Left has created so much unnecessary confusion.