If a market is shared equally by four firms, the Herfindahl-Hirschman Index is

To calculate personal savings, you would need information on all of the following except:

a. personal disposable income. b. personal consumption expenditures. c. interest paid to business. d. government expenditure. e. personal transfer payments to foreigners.

Suppose a monopoly sells to two identifiably different types of customers, A and B, who are unable to practice arbitrage. The inverse demand curve for group A is PA = 10 - QA, and the inverse demand curve for group B is PB = 18 - QB. The monopolist is able to produce the good for either type of customer at a constant marginal cost of 2, and the monopolist has no fixed costs. If the monopolist is

able to practice group price discrimination, the values of the elasticities of the two groups at the profit-maximizing prices are A) ?A = -1.25, and ?B = -1.5. B) ?A = -1.5, and ?B = -1.25. C) ?A = -0.67, and ?B = -0.8. D) ?A = -0.8, and ?B = -0.67.