[butlerm]

> Your first mistake is assuming that ... your...account now holds USD $500.

Same mistake with making an uninsured deposit at any bank. A deposit at a modern bank is just a possibly insured low or no interest loan to the bank. It does not mean that the bank actually has sufficient assets to back it up or can liquidate them in time. It is bank money exchangeable for U.S. currency, but not U.S. currency. A large number of mostly business depositors at three sizable banks almost found that out the hard way in the past few months. If the FDIC did not stretch the law those businesses might be getting cents on the dollar months if not years down the road.