Shifts in the Market Supply Curve | 市场供给曲线的移动

📚 Shifts in the Market Supply Curve | 市场供给曲线的移动

In A-Level Economics, the market supply curve is one of the most frequently examined tools for explaining how producers respond to changing market conditions. A shift of the supply curve is not the same as a movement along the curve: the former means that at every possible price, a different quantity is supplied, while the latter is caused only by a change in the good’s own price. This article explores the main causes of rightward and leftward shifts in market supply, with clear examples and exam-focused explanations.

在 A-Level 经济学中，市场供给曲线是解释生产者如何应对市场条件变化时最常考查的工具之一。供给曲线的移动与沿曲线移动不同：前者意味着在每一个可能价格下，供给量都发生了变化；后者仅由商品自身价格变化引起。本文将探讨市场供给曲线向右和向左移动的主要原因，并提供清晰的例子和备考重点。

1. The Supply Curve and the Law of Supply | 供给曲线与供给定律

The supply curve shows the relationship between the price of a good and the quantity that producers are willing and able to sell in a given time period, holding all other factors constant. It normally slopes upward from left to right, reflecting the law of supply: as the price rises, firms have a greater incentive to supply more because higher prices can cover higher marginal costs and increase potential profit.

供给曲线表示在某一时期内、在其他条件不变的情况下，商品价格与生产者愿意并且能够出售的数量之间的关系。供给曲线通常从左下向右上倾斜，体现了供给定律：当价格上升时，企业有更大动力增加供给量，因为更高的价格可以弥补更高的边际成本并增加潜在利润。

In a market, the market supply curve is the horizontal summation of all individual firm supply curves. If a single producer would supply 10 units at $5 and another supplies 20 units at $5, the market

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