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总需求的基础是全体购买者的购买行为。宏观经济政策只有影响了总购买行为才能影响总需求。总需求决定于总购买意愿和交易手段的可得性。
The total demand is based on the purchase behavior of all buyers. Macroeconomic policies affect aggregate demand only if they affect the total purchase. The total demand depends on the total purchase intention and the availability of trading instruments.