> After you build up enough deposits, start making loans to make money. Downturn hits. Depositors want to withdraw more money than you've kept around. You st

> After you build up enough deposits, start making loans to make money. Downturn hits. Depositors want to withdraw more money than you've kept around. You start trying to delay withdrawals long enough to satisfy them with the upcoming loan payments. Some of those payments start to be late. More people start demanding that you give them all their deposits back. Eventually get arrested, tried and jailed for running an unregulated, uninsured wildcat bank.