This document summarizes the key concepts of market supply and market equilibrium. It defines supply as the quantity supplied of a good at a given price based on producer plans. The law of supply states that quantity supplied increases with price. A supply curve graphs this relationship. Changes in supply are caused by changes in input prices, technology, number of producers, or expected future prices. Market equilibrium occurs where quantity demanded equals quantity supplied at the equilibrium price, clearing the market of surpluses or shortages. The effects of changes in demand and supply on equilibrium price and quantity are also discussed.