【单选题】Suppose Sam plans to buy only popcorn and soda. He has $40 to spend per week. A change in which of the following variables will change Sam's consumption possibilities? I. price of popcorn II. income...
【单选题】Mario sees popcorn and pretzels as perfect substitutes. He is always willing to substitute 3 cups of popcorn for 1 cup of pretzels. If Mario consumes only popcorn, then we know that the relative price...