In an economy with commodity money, for instance, if both gold and silver coins are in use (in circulation) at the same time, an interesting situation emerges. Since gold as a commodity has a greater value than silver, nobody wants to spend coins in his/her pouch and everyone tries to spend silver coins first. If everybody behaves like that, the money passing from hand to hand will be silver coins and gold coins will stay in people’s pouch. If we call silver coins as bad money and gold coins as good money, we can easily say that bad money drives out good money in the market. This phenomenon is known as Gresham’s Law.