A-Level Edexcel Economics: Demand and Supply Key Points | A-Level Edexcel 经济：需求与供给 考点精讲

📚 A-Level Edexcel Economics: Demand and Supply Key Points | A-Level Edexcel 经济：需求与供给 考点精讲

This comprehensive revision guide covers the essential demand and supply topics for the Edexcel A-Level Economics specification. Mastering these fundamentals is crucial for understanding how markets operate, how prices are determined, and how economic agents respond to changes in market conditions.

本综合复习指南涵盖爱德思 A-Level 经济考试大纲中需求与供给的核心考点。掌握这些基础知识对于理解市场如何运作、价格如何决定以及经济主体如何应对市场条件变化至关重要。

1. The Law of Demand | 需求定律

The law of demand states that, ceteris paribus, there is an inverse relationship between the price of a good and the quantity demanded. When price increases, quantity demanded decreases; when price decreases, quantity demanded increases.

需求定律指出，在其他条件不变的情况下，一种商品的价格和需求量之间存在反向关系。价格上升，需求量下降；价格下降，需求量上升。

This relationship is illustrated by a downward-sloping demand curve. The demand curve shows the quantity of a good that consumers are willing and able to purchase at each price, per period of time.

这一关系可以用一条向下倾斜的需求曲线来表示。需求曲线显示了消费者在每个价格水平上愿意并能够购买的商品数量（每单位时间）。

The two key reasons for the downward slope are the income effect and the substitution effect. The income effect: as price falls, the consumer’s real purchasing power increases, so they can buy more. The substitution effect: as price falls, the good becomes relatively cheaper compared to substitutes, prompting consumers to switch away from substitutes.

需求曲线向下倾斜的两个关键原因是收入效应和替代效应。收入效应：价格下降时，消费者的实际购买力提高，从而可以购买更多该商品。替代效应：价格下降时，该商品相对于替代品变得更便宜，促使消费者从替代品转向该商品。

A demand schedule is a table that shows the relationship between price and quantity demanded. For example:

需求表是一个显示价格与需求量关系的表格。例如：

Note that the relationship is inverse: as price falls, quantity demanded rises.

请注意，这一关系是反向的：价格下降时，需求量上升。

2. Movements along vs. Shifts of the Demand Curve | 需求量的变动与需求的变动

A movement along the demand curve is caused solely by a change in the price of the good itself, leading to

Published by TutorHao | A-Level Economics Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）