A copyright grants the creator of a book, film, or piece of software exclusive legal rights to use the creation for how long?

Vertical contracts between manufacturers and retailers often aim to

a. Incentivize the retailers to undertake costly activities, which they otherwise may not realize the full benefits of on their own b. Serve as a "signal" of the manufacturer's belief of the likely success of his product c. Reimburse the retailer for the cost of managing an extended inventory d. All of the above

If the marginal propensity to consume (MPC) is 0.96, the value of the spending multiplier is:

a. 25. b. 40. c. 96. d. 100.