The theory considers aggregates of quantity demanded by buyers and quantity supplied by sellers at each possible price per unit.

该理论考虑，在每一个可能的单位价格上，买方总的需求量和买方总的供应量。

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Section three shows demand and supply theory including how to achieve an equilibrium price and equilibrium quantity, the effects of excess supply and demand on market equilibrium.

第三节显示需求和供给理论，包括如何实现均衡价格和均衡数量，超额供给和需求对市场均衡的影响。

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How the price level is determined and why it might change over time is called the quantity theory of money.

价格水平如何决定、它为何会随时间改变，对此的(一种)解释是货币数量论。

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In theory, a discretionary central bank could limit the quantity of money and achieve long-run price stability by controlling the growth of nominal final demand.

FORBES: The Federal Reserve's Flawed Approach To Monetary Policy