【单选题】When new firms choose to enter monopolistically competitive markets:
A.
there must be little diversity of products in the market.
B.
they are guaranteed economic profits upon entry.
C.
some firms in the market must be making economic profits.
D.
the demand curve faced by an established firm will shift to the right as a result.
【单选题】When new firms enter a monopolistically competitive industry:
A.
the average total cost curves of established firms will shift downward.
B.
the demand curve of an established firm is reduced at each level of output.
C.
the established firms will each increase production.
D.
the average revenue received by an established firm will increase at each level of output.
【单选题】关于发动机机油消耗超标的原因,下列说法不正确的是()
A.
活塞、活塞环与缸壁磨损严重,造成配合间隙过大所致
【单选题】关于机油消耗过大的说法不正确的是( )。
【单选题】I类砂宜用于强度等级大于( )的水泥混凝土。
【单选题】When new firms have an incentive to enter a competitive market, their entry will
A.
increase the price of the product.
B.
drive down profits of existing firms in the market.
C.
shift the market supply curve to the left.
D.
increase demand for the product.
【单选题】Which of the following does not happen when new firms enter a monopolistically competitive industry?
A.
The demand curve for each of the existing firms will fall.
B.
The demand curve for each of the existing firms will move inward.
C.
The demand curve for each of the existing firms will becomes relatively more elastic.
D.
The demand curve for each of the existing firms will shift to the right.
【单选题】When new firms enter a perfectly competitive market,
A.
profits of existing firms will fall.
B.
entering firms will earn zero profit as soon as they enter.
C.
existing firms will see their costs rise.
D.
consumers will likely observe increasing prices.
【单选题】关于发动机机油消耗超标的原因,下列说法不正确的是()。
A.
活塞、活塞环与缸壁磨损严重,造成配合间隙过大所致