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The Keynesian idea that prices are "sticky" is best summarized by which of the following statements?
In the short run, input prices tend to change more quickly than output prices.
In the long run, prices for luxury goods tend to be fairly stable compared to other kinds of goods.
In the short run, output prices tend to change more quickly than input prices.
In the long run, all prices can change easily.
In the short run, prices for staple food items do not change often.