Which of the following is an example of a good that is excludable and nonrivalrous?

A movement upward along the consumption function can be caused only by a(n)

A. increase in disposable income. B. decrease in disposable income. C. decrease in the price level. D. increase in the price level.

If Alex uses $800 from her checking account to pay her credit card balance, her wealth:

A. increases by $800. B. does not change. C. decreases by $800. D. increases by $1,600.