I'll give you an example. Take a look at LIBOR (somebody should, 'cause the mean-stream media has hardly mentioned it):
http://en.wikipedia.org/wiki/Libor_scandal
From CNN: "Libor is the world's most important benchmark for interest rates. Roughly $10 trillion in loans -- including credit card rates, car loans, student loans and adjustable-rate mortgages -- as well as some $350 trillion in derivatives are tied to Libor."