Comment by Arbalest

GP starts with a fairly simple premise, the rate of default is high, so that much interest is required to make up the shortfall. Of course the rest of it is hinged solely on this premise, rather than acknowledging that the very act is taking advantage of people who can't or won't think far enough ahead to see why it is a very bad idea. It is of course the old argument that some economists use a little too regularly that all participants in the economy are rational actors.