Some abuse of wealth for political power may be inevitable but some countries are a lot better at limiting it than others.
For example here in France the amount of money politicians can spend on campaigning is strictly limited (and reimbursed by the state for those that pass a certain threshold of the vote). I'm not saying that it's perfect or that abuse doesn't sometimes still occur (as the current court case involving ex president Sarkozy shows) but I think it does improve things a lot.
Contrast that with the American system where to have any chance of becoming president (no matter which party you support) you basically have to be rich. And where multiple lobbyists and special interest groups basically buy the policies they want...
For example here in France the amount of money politicians can spend on campaigning is strictly limited (and reimbursed by the state for those that pass a certain threshold of the vote). I'm not saying that it's perfect or that abuse doesn't sometimes still occur (as the current court case involving ex president Sarkozy shows) but I think it does improve things a lot.
Contrast that with the American system where to have any chance of becoming president (no matter which party you support) you basically have to be rich. And where multiple lobbyists and special interest groups basically buy the policies they want...