If you're at a school fair, and the price of a toy is $10 that’s what buyers and sellers agree on.Now, the school makes a rule: "No one can sell this toy for more than $12.Will this rule change anything? No!Why? Because the toy was already being sold for $10, which is lower than $12. People will still buy and sell at the same price. The rule doesn’t affect anyone.That’s why we say: "The price ceiling is not binding and will have no effect on the market."