The situation with dollars reminds me of the situation of bitcoin on MtGox just before it collapsed. The bitcoin price on MtGox diverged from the price on other

The situation with dollars reminds me of the situation of bitcoin on MtGox just before it collapsed. The bitcoin price on MtGox diverged from the price on other exchanges. To a casual user it looked like you were getting a good deal by buying it on MtGox but that's because the last people out wouldn't be able to actually withdraw it, because the promise of a bitcoin from an exchange is not the same thing as an actual bitcoin.