The table above gives the demand for a monopolist's output. What is the marginal revenue of increasing production from 4 to 5 units?

Which of the following does not constitute a household consumption item?

a. A pair of jeans b. A bottle of Beck's beer c. A haircut d. A steam turbine electric generator e. A packet of breakfast cereal

Many ecologists argue that several species of whales are close to extinction. If this is TRUE, the reason is

A) inadequate enforcement of international laws. B) whales are a type of common property. C) the marginal benefit of hunting and killing a whale is greater than zero. D) whale-killing technology is too productive.