📚 Definition and Measurement of Exchange Rates | 汇率的定义与测量
Exchange rates are the price of one currency expressed in terms of another. They influence the global flow of goods, services, and capital, and are closely monitored by governments, central banks, and businesses. A solid understanding of how exchange rates are defined, quoted, and measured is fundamental for any student of international economics. This article explores the key definitions — nominal, real, and effective exchange rates — the methods used to measure them, and how they behave under different exchange rate systems.
汇率是以另一种货币表示的一种货币的价格。它影响着商品、服务和资本的国际流动，受到政府、央行和企业的高度关注。牢固掌握汇率的定义、报价方式和测量方法，是国际经济学学习者的基础。本文将探讨名义汇率、实际汇率和有效汇率等关键定义，以及测量汇率的方法，并介绍不同汇率制度下汇率的变动方式。
1. What is an Exchange Rate? | 什么是汇率？
An exchange rate is the rate at which one currency can be exchanged for another. It represents the external value of a currency and is determined in the foreign exchange market, where currencies are traded 24 hours a day.
汇率是一种货币兑换另一种货币的比率，它代表了一种货币的对外价值，由全球24小时运作的外汇市场决定。
For example, if the exchange rate between the US dollar and the euro is quoted as EUR/USD 0.92, it means that 1 US dollar can be exchanged for 0.92 euros. Such a rate simply tells us the price of one currency in units of another.
例如，如果美元兑欧元的汇率报价为欧元/美元 0.92，这意味着1美元可以兑换0.92欧元。这样一个汇率直接告诉我们一种货币用另一种货币表示的价格。
Exchange rates can be expressed in different ways depending on which currency is taken as the base, which leads to the concepts of direct and indirect quotation essential for precise measurement.
根据将哪一种货币作为基准，汇率可以用不同的方式表示，这就引出了对精确测量十分重要的直接标价法和间接标价法。
2. Direct and Indirect Quotation | 直接标价法与间接标价法
A direct quotation expresses the amount of domestic currency needed to purchase one unit of foreign currency. For the euro area, a direct quote for the US dollar would be EUR/USD 0.92, meaning it costs €0.92 to buy one US dollar.
直接标价法表示购买一单位外币所需的本币数量。对欧元区而言，美元的直接标价为欧元/美元 0.92，也就是购买1美元需要0.92欧元。
An indirect quotation, in contrast, gives the amount of foreign currency received for one unit of domestic currency. In the same case, the indirect quote would be USD/EUR 1.087, meaning 1 euro buys about 1.087 US dollars.
与之相对，间接标价法表示一单位本币所能获得的外币数量。在上述例子中，间接标价即为美元/欧元 1.087，即1欧元可以购买约1.087美元。
Which quotation is used depends on local conventions. Most countries, including the UK and the euro area, typically quote the foreign currency price of one unit of domestic currency (indirect quotation) for major pairs, but the direct method is analytically clearer when discussing
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