Avocados

In the 13th Century, avocados were used as currency by the Mayans as they were so plentiful in Central America. Unfortunately, their exchange rate wasn't very high. In order to carry enough avocados for a day's worth of living expenses, Mayans had to be very strong. Paydays were really tough too. Most Mayans agreed that the toughest part about having avocados as your main currency was the possibility that your pocket change would go bad if left in enclosed containers for too long.