The Herfindahl-Hirschman index is measured by
A) adding the market shares of all firms in an industry.
B) adding the squares of the market shares of all firms in an industry.
C) squaring the sum of the market shares of the all firms in an industry.
D) adding the market shares of the four largest firms in an industry.
B
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The table below shows how the payoffs to two political candidates depend on whether the candidates run a positive or negative campaign. The payoffs are given in terms of the percentage change in the number of votes received. 
Running a negative campaign is ________ for the ________ candidate.
A. a dominant strategy; Democratic B. neither a dominant nor dominated strategy; Republican C. a dominated strategy; Democratic D. a dominated strategy; Republican
Which of the following is NOT a part of the Federal Reserve System?
A) the Federal Deposit Insurance Corporation B) the Board of Governors C) the Twelve District Federal Reserve banks D) the Federal Open Market Committee
If the amount paid as unemployment benefits decreases, the opportunity cost of job search
A) falls and people stay unemployed for a shorter time. B) rises and people would stay unemployed longer. C) rises and people stay unemployed for a shorter time. D) falls and people stay unemployed for a longer time. E) is not affected because unemployment benefits do not change job availability.
Refer to the table above. What is the marginal product of the sixth worker?
A) 20 pairs of shoes B) 46.7 pairs of shoes C) 60 pairs of shoes D) 280 pairs of shoes