The entire quote is from Paul Krugman of The New York Times:
Why corruption matters. Hint: It’s not the money, it’s the incentives.
When money corrupts the decision-makers, the decisions they make may ultimately have nothing to do with right, wrong, public interest or anything but how the decision affects a business interest or a pay-day.
If everything is about money, the moral and ethical elements that would normally be part of the decision-making process disappear.