The math really is not that hard, so I am not sure why it is not more widely known. Yet even the Payday Loan Industry Watch and the FED do not seem to understand it (or the FED pretends to not understand it)
http://www.pliwatch.org/news_article_060913A.html"According to the U.S. Federal Reserve, loans typically total $500 or less with fees ranging from $15 to $100. As the loans typically last for just two weeks, however, annualized interest rates could reach 1,000 percent."
Which is just wrong. Rates actually reach 10,000 percent or more. Unfarkingbelievable, but true. It's the power of compounding. One example given in the articles is a loan of $300 for two weeks which charges $60 interest. That's 20% in two weeks. The Payday Loan Places multiplies 20 by 26 and advertises that as an APR of 520%. But that's not how compounding works. A $300 loan at 520% APR would charge $1,560 interest in a year's time if no payments were made. However, look at what actually happens.
300
360
432
518.4
622.08
746.5
895.8
1074.95
1289.95
1547.93
1857.52
2229.02
2674.83
3209.8
3851.75
4622.11
5546.53
6655.83
7987.00
9584.4
11501.28
13801.53
16561.84
19874.21
23849.05
28618.86
34342.63
$300 grows to $34,342.63 in just a year's time. That's not a bad little return on an 'investment' if you can find a bunch of people with the combination of stupidity and desperation enough to pay those kind of rates. That's $300 + 34,042.63 in interest. Interest/principle * 100 = an APR of 11,347.5%.
If their profitability prevents them from being closed or restricted by regulation, then perhaps they could be sued for false advertising. I think I should get a small finder's fee for this though. Not too much. Let's just say a penny on one square of a chessboard then two pennies on the next square, four on the next one and so on, until all the squares are covered with pennies. :evilgrin: