问答题

For two goods X and Y to be classified as substitutes, it must be the case that:

答案： A.when the price of X rises, the demand for Y decreases.

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Suppose that the price of doughnuts decreases and that doughnut-holes are a by-product of producing doughnuts. One would expect:

答案： A.the supply of doughnut-holes to increase.
B.the supply...