Fractional Reserve Banking is responsible for something we all nowadays take as a positive thing because it means we get a day off work. Bank Holidays. The origin of bank holidays is historically based on banks taking a holiday from paying out to customers. They could tally the books during this holiday and ensure that they weren’t technically insolvent from having lent out too much money against deposits. The idea is that, if the bank was insolvent, they could call in a few favours during the day off and be in a position to continue the business, as usual, the next day of opening. If it sounds like something ancient, think again. The whole USA even had an eight-day bank holiday in 1933, after an emergency law was passed to stop more banks from going bust.