Checking And Balancing

It seems to me that most Americans (except Dick Cheney) favor the systems of checks and balances that we have in place for our system of government. Why is it that so many people do not favor a system of checks and balances for our economic system? If we do not want our government to run amok, shouldn’t we also not want capitalism to run amok? In other words, why do so many fear an unrestricted government, yet they do not fear unrestricted corporations?