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

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