Try this:

USdebtmaths.jpg

Via Samizdata. Read the comments too:

My favourite question to people who say that this stuff is complicated is to ask them at what point the rules of money change.

Money is like physics – the rules that apply to an atom also apply to planet. In the same way that you can’t solve your credit card debt by giving your kids more pocket money, so you also can’t solve the country’s economy by throwing more money at an Olympic opening ceremony.