With identical firms, constant input prices, and all the other characteristics of a competitive market _____. Group of answer choices a shift in demand has no effect on the long-run average cost, resulting in a change in equilibrium quantity but not price a shift in demand has no effect on the long-run average cost, resulting in a change in equilibrium price but not quantity a shift in demand will change the both the equilibrium price and quantity in the long run. a shift in demand has no effect on the long-run average cost and so there is no change in equilibrium price and quantity