An example of this would be a customer wishing to borrow $1000 in cash having their bank buy $1,100 worth of a commodity such as iron from a supplier, buying the iron from the bank on credit with 12 months to pay the $1100 back, immediately selling the metal back to the bank for $1000 cash to be paid on the spot. The bank resells the iron to the supplier. (This would be the equivalent of borrowing $1000 for a year at an interest rate of 11 per cent.)