[dragonwriter]

> Edit: this is an interesting point, though. Ignoring the insurance issue, what would a bank do if you asked to open a deposit account with a billion dollars (paying, say 2%/year)? My uninformed layman's speculation would be that they would reject you because they wouldn't know what to do with that much money: they have to somehow lend out enough of it to at least break even on the 20 million/year that they're paying you for interest, but at the same time they have to be able to give you back your 1 billion at any time you ask for it.

Large banks deal with deposits in total orders of magnitude greater than that (the top banks have over $1 trillion each in deposits.) $1bn in a single demand deposit account is stupid for the depositor, but it doesn't move the needle on a major banks total of deposit accounts, and they can deal with it just fine.