As the price is raised along a straight-line demand curve, the demand curve becomes more elastic

John has a marginal benefit of $7 for 1 slice of pizza, $5 for a second slice, $3 for a third slice, $1 for a fourth slice, and $0.50 for a fifth slice. The price of pizza is $1.50 per slice. Which of the following statements is correct?

A) John will purchase 3 slices of pizza and have consumer surplus of $10.50. B) John will purchase 4 slices of pizza and have consumer surplus of $12.00. C) John will purchase 2 slices of pizza and have consumer surplus of $1.50. D) John will purchase 3 slices of pizza and have consumer surplus of $4.50. E) John will purchase 2 slices of pizza and have consumer surplus of $3.00.

The "free rider" problem occurs when a good is

a. not available. b. not excludable. c. not depletable. d. not sold in free markets.