壟斷性競爭：练习题

• a.

  The demand curve shifts to the left indefinitely

• b.

  The demand curve becomes downward sloping

• c.

  The demand curve becomes vertical

• d.

  The demand curve becomes perfectly elastic

• a.

  It produces on the downward-sloping portion of its average cost curve, to the left of the minimum point

• b.

  It earns supernormal profits which prevents entry by new firms

• c.

  It produces at the minimum point of its long-run average cost curve

• d.

  It produces at an output level where price is equal to marginal cost

• a.

  Firms face a perfectly elastic demand curve

• b.

  There is freedom of entry and exit in the long run

• c.

  Firms are allocatively efficient in the long run

• d.

  Firms produce homogeneous products

• a.The firm is allocatively inefficient because price (\(P\)) is greater than marginal cost (\(MC\)).
• b.The firm earns supernormal profits because barriers to entry prevent new firms from entering the market.
• c.The firm is productively efficient because it produces at the minimum point of its average total cost (\(ATC\)) curve.
• d.The firm is allocatively efficient because it produces where marginal revenue (\(MR\)) equals marginal cost (\(MC\)).

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。