供给变动（change in supply）由非价格因素引起的销售量的变化。简而言之，就是供给曲线的移动。
货币中性：认为货币供给变动并不影响真实变量的观点。
Monetary neutrality is the proposition that changes in the money supply do not affect real variables.
唯一不带来变动的价格就是p*，即能够使需求数量等于供给数量的均衡价格。
The only price which doesn’t lead to price changes is p*, the equilibrium
唯一不带来变动的价格就是p*，即能够使需求数量等于供给数量的均衡价格。
The only price which doesn’t lead to price changes is p*, the equilibrium price in which the quantity supplied equalsthe quantity demanded.
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