Disequilibrium occurs when

quantity supplied is equal to quantity demanded.

quantity supplied does not equal quantity demanded.

supply coordinates with price.

supply coordinates with quantity.

(economics)

Disequilibrium occurs when quantity supplied does not equal quantity demanded. When disequilibrium occurs, it usually leaves two things as a result : shortage and a surplus. Shortage is when the quantity demanded is greater than that which is supplied, and surplus is just the opposite to shortage. Keep in mind that position of shortage is always below equilibrium ...

Quantity supplied does not equal quantity demanded.