题目内容
A firm is producing 1,000 units at a total cost of $5,000. If it were to increase production to 1,001 units, its total cost would rise to $5,008. What does this information tell you about the firm?（ ）
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A firm is producing 20 units with an average total cost of $25 and marginal cost of $15. If it were to increase production to 21 units, which of the following must occur? ( )
Raj opens up a lemonade stand for two hours. He spends $10 for ingredients and sells $60 worth of lemonade. In the same two hours, he could have mowed his neighbor’s lawn for $40. Raj has an accounting profit of ( ) and an economic profit of( ).
Raj opens up a lemonade stand for two hours. He spends $20 for ingredients and sells $80 worth of lemonade. In the same two hours, he could have mowed his neighbor’s lawn for $40. Raj has an accounting profit of （ ） and an economic profit of（ ).
If the consumer price index is 200 in year 1980 and 400 today, then $600 in 1980 has the same purchasing power as （ ）today.
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