Which of the following is TRUE about species in the world?
A) Most extinct species became extinct within the past 30 years.
B) The majority of extinct species became extinct before humans appeared.
C) Extinct species became extinct only after human appeared.
D) No species has ever become extinct.
Answer: B
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In the United States, an official dating of business cycles
a. is executed by the Federal Reserve Bank of New York. b. originates with the Department of Commerce. c. was started by the Bureau of Labor Statistics Institute. d. is performed by the Business Cycle Dating Group of the National Bureau of Economic Research.
Diminishing marginal product suggests that the marginal
a. cost of an extra worker is unchanged. b. cost of an extra worker is less than the previous worker's marginal cost. c. product of an extra worker is less than the previous worker's marginal product. d. product of an extra worker is greater than the previous worker's marginal product.