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【多选题】
根据来源和生存周期的不同分类,专题可分为 ( ) 。A.
事件类专题
B.
主题类专题
C.
栏目类专题
D.
资讯服务类专题
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【简答题】简述循环经济的实现模式
【单选题】The zero-profit price for a firm in perfect competition:
A.
is a price just sufficient to cover fixed cost.
B.
is at the point where total revenue from sales is at its minimum level.
C.
occurs at the point where marginal and average cost are equal.
D.
occurs at the point where marginal cost is at its minimum level.
【单选题】When marginal cost is greater than zero, the profit-maximizing point price elasticity of demand must be:
A.
greater than zero but less than one.
B.
equal to one.
C.
greater than one.
D.
equal to zero.
【单选题】When marginal profit equals zero:
A.
the firm can increase profits by increasing output.
B.
the firm can increase profits by decreasing output.
C.
marginal revenue equals average revenue.
D.
profit is maximized.
【简答题】长期零经济利润条件(long-run zero-profit condition)
【单选题】In economic analysis, any amount of profit earned above zero is considered "above normal" because:
A.
normally firms are supposed to earn zero profit.
B.
this would indicate that the firm's revenue exceeded both its accounting and opportunity cost.
C.
this would indicate that the firm was at least earning a profit equal to its opportunity cost.
D.
this would indicate that the firm's revenue exceeded its accounting cost.
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