Any firm?s ________ equals P × q.

Which of the following decreases aggregate demand and shifts the AD curve leftward?

A) a tax cut B) an increase in quantity of money C) an interest rate hike D) a decrease in potential GDP E) an increase in government expenditures on goods and services

The table above shows information about the costs and benefits of a steel smelter that pollutes the air of a city

If the marginal external cost is $10 per ton at every quantity of steel produced, the equilibrium quantity when the steel industry is unregulated is ________ tons per week. A) 5 B) 15 C) 20 D) 25