Which of the following is used to explain why a consumer's willingness to buy Microsoft Office increases as the number of other people who use Microsoft Office increases?

Which of the following situations is a clear application of the benefits principle of taxation?

a. wealthier people are taxed more heavily b. heavier vehicles are charged higher tolls on turnpikes c. state government providing a free education to any child in the state d. sales of measles vaccine exempt from sales tax

If the relative price of one unit of good Y is 0.25 units of good Z, then it follows that the absolute price of good Z can be __________ and the absolute price of good Y can be __________

A) $4,000; $2,000 B) $1,000; $2,000 C) $2,000; $1,000 D) a and c E) none of the above