Which of the following condition will both consumers and sellers benefit?
a.) when demand exceeds supply
b.) when supply exceeds demand
c.) when supply equals demand

Option C) When supply equals demand.

The most common supply curve decreases with price. The most common demand curve increases with price. The point at which supply and demand curves intercept each other is the equilibrium point. At that point (equilibrium), there are consumers who are paying less than what they are willing to pay (generating a consumer surplus) and there are producers who are selling at a price that is higher than what they are willing to receive (generating a producer surplus), then both consumer and producers benefit.