Which of the following events must cause equilibrium quantity to fall? a. demand increases and supply decreases b. demand and supply both decrease c. demand decreases and supply increases d. demand and supply both increase

b. demand and supply both decrease 

Explanation:

Equilibrium quantity can be found at the intersection of the demand and supply curve.

If demand decreases, it means that the demand curve has shifted to the left. It indicates that the demand of consumers have fallen.

If supply decreases, it means that the supply curve has shifted leftward. It indicates that supply has fallen.

The effect on equilibrium price would be indeterminate.

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