To study macroeconomics, one needs various models with different assumptions about the flexibility and/or stickiness of price levels. This is because:     A.) the price flexibility is a short-run phenomenon while, the price stickiness is a long-run phenomenon.     B.) the economy behaves so differently depending on how much time has passed after a demand shock.     C.) various government policies are useless to eliminate the effects of an unexpected demand shock.     D.) the economy behaves similarly to demand shocks regardless of the length of time.

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