The Marshall-Lerner condition holds that a country's current account balance will ________ in response to a real ________ in a nation's currency if ________. ( ) A: worsen; depreciation; sum of the price elasticities of export and import demand exceeds 0 B: improve; depreciation; sum of the price elasticities of export and import demand exceeds 1 C: improve; appreciation; sum of the price elasticities of export and import demand exceeds 0 D: worsen; depreciation; sum of the price elasticities of export and import demand exceeds 1

The Marshall–Lerner condition indicates a stable foreign<br/>exchange market if the sum of the price elasticities of the demand<br/>for imports and the demand for exports0, in absolute terms, is less<br/>than 1. ()

The incidence of sales tax is determined by the A: A) level of government (for example, local, state, or federal) which imposes the tax. B: B) federal government in all cases. C: C) greed of the sellers. D: D) price elasticities of supply and demand.

Which of the following is the least likely outcome when a monopoly adopts perfect price discrimination because of the customers’ differing demand elasticities（） A: The monopolist shares the total surplus with consumers. B: The price for marginal unit is less than the price for other units. C: The output increases to the point at which price equals the marginal cost.