Aggregate Demand | 总需求

📚 Aggregate Demand | 总需求

Aggregate demand (AD) is the total planned spending on domestically produced final goods and services at a given overall price level over a period of time. In Cambridge A-Level Economics, AD is a central macro concept because it links households, firms, government and the external sector to national output and the price level. Understanding what shifts AD and what causes movements along the AD curve helps explain booms, recessions, inflation and policy choices.

总需求（AD）是在某一总体价格水平下，一个经济在一定时期内对国内生产的最终商品和服务的计划总支出。在剑桥 A-Level 经济中，AD 是核心宏观概念，因为它把家庭、企业、政府和对外部门与国民产出和价格水平联系起来。理解什么因素使 AD 移动、什么因素引起沿 AD 曲线的变动，有助于解释繁荣、衰退、通货膨胀和政策选择。

1. What Is Aggregate Demand? | 什么是总需求？

AD is the planned total expenditure on domestically produced final goods and services at different average price levels. It is not the same as spending in a single market; it covers the whole economy. The AD curve shows the relationship between the general price level and

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