Suppose there's an 80% chance of a stock rising by 20% and a 20% chance of it falling by 40%. What is the expected rate of return on the stock?

Which of the following questions is NOT a microeconomic question?

A) Can the Federal Reserve keep income growing by cutting interest rates? B) How would a tax on e-commerce affect eBay? C) What is Britney's opportunity cost of having another baby? D) Does the United States have a comparative advantage in information technology services?

A student that asks interesting questions during the lecture generates

A) positive externalities. B) no externalities. C) negative externalities. D) an excludable good.