A horizontal aggregate supply curve indicates that equilibrium real GDP is determined by aggregate supply

If the government offers to reduce your property taxes by 10 percent if you install solar heating for your home, this would be an example of

A) a violation of the rational assumption. B) incentives. C) disincentives. D) ceteris paribus.

Suppose a ten firm industry has total sales of $35 million per year. The largest firm have sales of $10 million, the third largest firm has sales of $4 million, and the fourth largest firm has sales of $2 million. If fifth through tenth largest firms

combined have annual sales of $12 million, the four-firm concentration ratio for this industry is A) 45.7 percent. B) 80 percent. C) 65.7 percent. D) none of the above.