49. In an economy, the supply curve of labor, S, is given by \( S = -100 + 250 \times Wn \). Where Wn is the net wage (after-tax wage rate). Assume that the gross wage (before-tax wage rate) is fixed at 10. At what tax rate are tax revenues maximized in this economy?
(A) \( 47.5\% \)
(B) \( 48\% \)
(C) \( 45\% \)
(D) \( 50\% \)

50. The current price of compact discs, which are traded in perfectly competitive markets, is $10. A $1 per unit tax is levied on the discs. Annual record sales decline from five million to four million as a result of the tax. Assuming that the income effect of the tax-induced price change is negligible, the excess burden of the tax will be: (A) $500,000 per year. (B) $1 million per year. (C) $2 million per year. (D) $2.5 million per year.

1. If the government requires a natural monopoly to price at marginal cost, (A) monopoly firms will earn the maximum economic profits because the marginal revenue equals the marginal cost. (B) monopoly firms will operate at a loss because price is lower than the average cost. (C) more firms will choose to enter the market. (D) producer surplus will increase because quantity supplied is greater.

2. Which of the following option could minimize the deadweight loss resulting from a specific tax? (A) Tax only wealthy firms and individuals. (B) Require companies, instead of consumers, to pay the tax. (C) Tax goods for which either supply or demand is inelastic. (D) Tax luxury items such as yachts and sports cars.

3. If the savings rate falls in the Solow growth model, (A) steady state capital per worker rises. (B) the steady state growth rate in output increases. (C) per worker output falls in the steady state. (D) per capita consumption falls in the short run.

4. The expenditure components of GDP include all of the following except (A) consumption. (B) investment. (C) net exports. (D) net factor payments.

5. Inventory investment in the GDP consists of (A) construction expenditures, raw materials, and inventories of finished goods. (B) goods in process, raw materials, and purchases of office machinery. (C) raw materials, goods in process, and construction expenditures. (D) inventories of finished goods, goods in process, and raw materials.

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