The document defines supply as the quantity of goods a seller is willing and able to sell at different prices in a given market at a given time. It provides definitions of supply from Thomas and Samuelson. Supply is influenced by price of the goods, prices of other goods, prices of production factors, and technology. The law of supply states that the quantity supplied increases when price rises and decreases when price falls, other things remaining the same. Supply schedules are provided for different goods like bread to illustrate how quantity supplied changes with price.