If a perfectly competitive firm is producing at the output level where marginal revenue is equal to marginal cost and at this output level, the market price is equal to the firm's average total cost, the firm is ________.
A) not producing at the profit-maximizing output level
B) earning economic profits
C) earning a competitive return
D) incurring an economic loss
C) earning a competitive return
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From the end of the Paleolithic to the year 1 A.D., the world's population changed from 30 million to __________
A. less than 10 million B. 100 million C. 300 million D. over half a billion
Which inflectional morpheme is acquired last by English-speaking children?
A possessive –s on nouns B past tense –ed on regular verbs C plural –s on nouns D third person –s on verbs E present progressive –ing on verbs
Experimental archaeologists have attempted to learn more about stone tools by doing all the following, EXCEPT:
a. replicating stone tool manufacturing methods. b. using stone tools to butcher an elephant. c. cutting down trees with stone axes. d. Observing ecological factors. e. traveling back in time.
Striking a core or flake with a hammer stone is called:
a. microliths. b. direct percussion. c. microwear. d. phytoliths. e. pressure flaking.