The government can _______________ change an inefficient market outcome (in the case where there is a negative externality) into an efficient outcome by imposing a tax on the activity that generates the negative externality

A flexible or floating exchange rate system is one in which the:

a. government closely monitors and controls the value due to the impact on trade flows. b. government makes no attempt to fix it against any base currency. c. government actively tries to achieve fluctuations in the rate. d. government fixes the rate against the currency of its largest trading partner.

The figure above shows the demand and cost curves for a single-price monopoly. The firm's economic profit equals

A) $0. B) $300. C) $100. D) $50.