Individual supply refers to the quantity a firm is willing to offer at different prices, while market supply is the total quantity all firms offer. A supply schedule shows quantities at prices, and a supply curve graphs this relationship. Supply is determined by technology, input prices, and policies. The law of supply states a direct relationship between price and quantity, assuming other factors are constant. A movement along the curve occurs due to price changes, while a shift happens due to other factor changes, such as input prices or technology. Price elasticity of supply measures responsiveness of quantity to price changes.