Gross Domestic Product, Gross National Product and Gross National Income | 国内生产总值、国民生产总值与国民总收入

📚 Gross Domestic Product, Gross National Product and Gross National Income | 国内生产总值、国民生产总值与国民总收入

In Cambridge A-Level Economics, national income accounting is a foundational topic. Students often confuse gross domestic product (GDP), gross national product (GNP) and gross national income (GNI). This article clarifies each concept, explains how they are measured and linked, and considers their usefulness in assessing living standards.

在剑桥 A-Level 经济学中，国民收入核算是基础主题。学生常混淆国内生产总值 (GDP)、国民生产总值 (GNP) 和国民总收入 (GNI)。本文阐明每个概念，解释它们如何衡量、如何相互关联，并探讨它们在评估生活水平方面的作用。

1. The Purpose of National Income Accounting | 国民收入核算的目的

National income accounting provides a systematic framework for measuring the total economic activity of a country. It allows economists, governments and international organisations to compare output over time and between countries, and to design macroeconomic policy.

国民收入核算提供了一个系统性框架，用于衡量一个国家的总体经济活动。它使经济学家、政府和国际组织能够比较不同时期和不同国家之间的产出，并制定宏观经济政策。

The three central aggregates – GDP, GNP and GNI – differ according to whether they measure activity within a country’s borders, activity by a country’s nationals, or income accruing to a country’s residents. These differences are not just technical; they affect international comparisons, policy decisions and development rankings.

三个核心总量指标——GDP、GNP 和 GNI——根据其衡量的是一个国家境内活动、该国国民的活动，还是该国居民获得的收入而有所不同。这些差异不仅是技术性的，它们还影响国际比较、政策决策和发展排名。

For Cambridge exams, candidates need to know the precise definitions, the formulas connecting them, and the reasons why a country might record a large gap between GDP and the other two measures.

对于剑桥考试，考生需要掌握准确的定义、连接三者的公式，以及为什么一个国家可能出现 GDP 与另外两个指标之间巨大差距的原因。

2. Defining Gross Domestic Product (GDP) | 国内生产总值 (GDP) 的定义

Gross domestic product is the total market value of all final goods and services produced within a country’s borders during a given time period, usually a year or a quarter. It uses market prices to aggregate different types of output.

国内生产总值是在一定时期（通常为一年或一个季度）内，一个国家境内生产的所有最终商品和服务的市场价值总和。它使用市场价格来汇总不同类型的产出。

The word ‘gross’ means that depreciation of capital is not subtracted. The word ‘domestic’ means the measure is based on location, not nationality. A Japanese factory in the UK contributes to UK GDP, while a British factory in Vietnam contributes to Vietnam’s GDP.

‘gross’ 一词表示没有扣除资本折旧。’domestic’ 一词表示该指标基于地点，而非国籍。位于英国的日本工厂计入英国 GDP，而位于越南的英国工厂计入越南 GDP。

Only final goods and services are counted to avoid double counting. For example, the value of steel sold to a car manufacturer is not counted separately if the final car price already includes it. Similarly, the sale of second-hand goods, such as used cars, is excluded from GDP because no new production has taken place that period.

为了避免重复计算，只计算最终商品和服务。例如，卖给汽车制造商的钢材价值不单独计算，因为最终汽车价格已经包含了它。同样，二手车等二手商品的销售不计入 GDP，因为当期没有发生新的生产。

Financial transactions such as the purchase of shares or government transfer payments are also excluded because they do not represent the production of new goods or services.

购买股票或政府转移支付等金融交易也不计入 GDP，因为它们并不代表新商品或服务的生产。

3. Three Approaches to Measuring GDP | 衡量 GDP 的三种方法

GDP can be measured using three equivalent approaches: the output approach, the income approach and the expenditure approach. In theory, all three should give the same total because one person’s spending is another person’s income.

GDP 可以用三种等价的方法来衡量：产出法、收入法和支出法。理论上，三种方法应得到相同的总额，因为一个人的支出就是另一个人的收入。

The output approach sums the value added at each stage of production. Value added is the value of output minus the cost of intermediate inputs. Suppose a farmer sells wheat for $100, a miller sells flour for $160, and a baker sells bread for $250. The value added at each stage is $100, $60 and $90, giving a total contribution to GDP of $250, the final value of the bread.

产出法将每个生产阶段的增加值相加。增加值等于产出价值减去中间投入成本。假设农民以 100 美元出售小麦，磨坊主以 160 美元出售面粉，面包师以 250 美元出售面包。每个阶段的增加值分别为 100 美元、60 美元和 90 美元，对 GDP 的总贡献为 250 美元，即面包的最终价值。

The income approach sums all factor incomes earned in production: wages and salaries for labour, rent for land, interest for capital and profit for entrepreneurship. Adding taxes less subsidies on products converts factor cost to market prices.

收入法将生产中获得的全部要素收入相加：劳动的工资和薪金、土地的租金、资本的利息以及企业家的利润。加上产品税减去补贴，可将要素成本转换为市场价格。

The expenditure approach is the most common in textbooks and is written as:

支出法是教科书中最常见的方法，写作：

GDP = C + I + G + (X − M)

Where C is household consumption, I is investment, G is government spending, X is exports, and M is imports. The term (X − M) is net exports. Investment includes business fixed investment, residential construction and changes in inventories.

其中 C 为家庭消费，I 为投资，G 为政府支出，X 为出口，M 为进口。(X − M) 一项为净出口。投资包括企业固定投资、住宅建设以及

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