Surplus

What Is Surplus?

A surplus, sometimes called excess supply, exists when the quantity producers offer for sale exceeds the quantity buyers wish to purchase at the prevailing price. It arises whenever the market price sits above the equilibrium price. With goods going unsold, inventory piles up and sellers face pressure to cut prices. In an unregulated competitive market, that pressure lowers the price until quantity demanded and quantity supplied are equal again and the market clears at equilibrium. A surplus can also be created deliberately: a binding price floor set above equilibrium, such as a minimum wage above the market-clearing wage, produces a persistent surplus. In that labor-market case, it means more people seeking work than employers wish to hire.

Why It Matters

Surpluses reveal how markets self-correct and what happens when they cannot. When a surplus is temporary, falling prices clear it quickly, demonstrating the market's tendency toward equilibrium. When a price floor holds the price above equilibrium, the surplus persists because the price cannot legally fall to clear the excess. This is the core critique of price floors: agricultural price supports leave unsold crops, and a minimum wage above equilibrium produces a labor surplus, or unemployment, in the standard model. Recognizing a surplus, and whether it is fleeting or policy-induced, helps students and policymakers anticipate the pressure on prices and the unintended consequences of setting prices away from where supply and demand would meet.

Test Your Knowledge

Questions on this topic from the EconRecall fact bank:

When the market price sits above the equilibrium price, what condition results?
A surplus, because quantity supplied exceeds quantity demanded
In an unregulated competitive market, how does a surplus tend to correct itself?
Unsold inventory pushes sellers to lower prices until the market clears at equilibrium
A price floor is binding only when it is set where relative to equilibrium, and what does it cause?
Above the equilibrium price, causing a persistent surplus