A price ceiling is the mandated maximum amount a seller is allowed to charge for a product or service. Usually set by law, price ceilings are typically applied to staples such as food and energy products when such goods become unaffordable to regular consumers. A price ceiling is essentially a type of price control. Price ceilings can be advantageous in allowing essentials to be affordable, at least temporarily.
Supply is the amount of some goods or services a producer is willing to supply at each price. Price is what the producer receives for selling one unit of goods or service. A rise in price almost always leads to an increase in the quantity supply of that good or service, while a fall in price will decrease the quantity supplied. Demand refers to the amount of some good or service consumers are willing and able to purchase at each price. If the price ceiling were fixed below the market price, supply would no longer meet demand.