背景速览

《经济学人》有个招牌专栏叫"巨无霸指数"：用各国麦当劳巨无霸的当地价格，来衡量货币的购买力、判断汇率是否"跑偏"。这个1986年创立的"玩笑式"指数今年迎来40岁生日，作者借巴黎"标准千克"（Le Grand K）作类比，指出当下美元、人民币、日元再度严重偏离购买力、全球货币之争又起，而这份"快餐指数"依然是难得的参照物。

英文原文

Locked in a vault near Paris, ensconced in three bell jars, sits a small cylinder of platinum alloy, forged in London in 1879. Known as Le Grand K, it long served as the definitive standard for measuring the kilogram. There is no universal standard for measuring the monetary heft or purchasing power of currencies. But The Economist has a favourite candidate. It weighs up to 240g. It is ensconced in a cardboard box. And you can find it under two Golden Arches. Our version of Le Grand K is the McDonald's Big Mac.

The Big Mac index we forged in London in 1986 will be 40 years old in September. What began as a playful thought experiment has taken on a life of its own. It has amused readers, intrigued currency traders and irritated central banks. It has also attracted critics who think fast food has nothing to say about global economics. It was born in an era of high monetary diplomacy, when policymakers fretted that the world's most important currencies were horribly misaligned, inviting financial calamity or trade protectionism. Forty years on, similar debates are raging once again, this time about the dollar, yuan and yen. In a world of currency tumult and controversy, our palatable guide to exchange rates is as valuable as ever.

中文译文

在巴黎附近的一座保险库里，一枚小小的铂合金圆柱体被安放在三个钟形玻璃罩内，它于1879年在伦敦锻造而成。它被称为"大K"（Le Grand K），长期以来一直充当衡量千克的权威标准。可是，衡量货币的"分量"或购买力，却不存在一个放之四海而皆准的标准。但《经济学人》有一个自己钟爱的候选对象。它重达240克。它被安放在一个纸板盒里。你可以在两座金色拱门下找到它。我们版的"大K"，就是麦当劳的巨无霸汉堡。

我们于1986年在伦敦"锻造"的巨无霸指数，将在今年9月迎来40岁生日。这个当初只是好玩的思想实验，如今已有了自己的生命力。它逗乐了读者，勾起了外汇交易员的兴趣，也让各国央行大为恼火。它也招来了批评者，他们认为快餐对全球经济没什么发言权。它诞生于货币外交风起云涌的年代，那时政策制定者忧心忡忡，担心世界最重要的几种货币严重错位，可能招致金融危机或贸易保护主义。四十年后的今天，类似的争论再度甚嚣尘上，这一次的主角是美元、人民币和日元。在这个货币动荡、争议不断的世界上，我们这份"美味可口"的汇率指南一如既往地有价值。

高频词短语

【calibrate】/ˈkælɪbreɪt/ v. 校准，标定

例句：Just as McDonald's calibrates the Big Mac, a central bank calibrates interest rates to keep inflation in check.

译文：正如麦当劳校准巨无霸一样，央行也要校准利率以控制通胀。

【misaligned】/ˌmɪsəˈlaɪnd/ adj. 错位的，失调的（文中指货币偏离其应有价值）

例句：When currencies are misaligned, exporters gain an unfair advantage in global trade.

译文：当货币失调时，出口商会在全球贸易中占据不公平的优势。

【stray】/streɪ/ v. 偏离；走神

例句：The yen has strayed far from the purchasing power implied by its exchange rate.

译文：日元已远远偏离其汇率所隐含的购买力。

【purchasing power】购买力

例句：Rising food prices are eating away at consumers' purchasing power.

译文：不断上涨的食品价格正在侵蚀消费者的购买力。

【eccentric】/ɪkˈsentrɪk/ adj. 古怪的，反常的

例句：Using a hamburger to judge the global economy may sound eccentric, but it works surprisingly well.

译文：用一只汉堡来评判全球经济，听起来古怪，但出奇地有效。

长难句速拆

原句：It was born in an era of high monetary diplomacy, when policymakers fretted that the world's most important currencies were horribly misaligned, inviting financial calamity or trade protectionism.

① 主干：It was born in an era，即"它诞生于一个……的年代"。

 ② 修饰：when 引导定语从句修饰 era；fretted that 后接宾语从句；inviting... 是结果状语。

 ③ 易卡点：when 是定语从句而非时间状语，别译成"当……时"；inviting 表"货币错位"引发的后果；horribly 是"极其"表程度，不是贬义。

考场应用

① 阅读理解：开头倒装句"Locked in a vault... sits a small cylinder"考主干识别（主语后置）；Le Grand K 可作例证题，问"用意"，答案是引出"衡量标准需权威参照"的类比。 

② 雅思写作 Task 2：100美元≈100欧元≈426元的汉堡购买力、"批评者嫌它太窄/太宽"的正反框架，可直接用于汇率与贸易失衡话题。 

③ 考研写作：可套用"What began as... has taken on a life of its own"、三平行结构"It has amused readers, intrigued traders and irritated central banks"、以及让步+亮明立场的收尾句式。

用一只汉堡丈量全球货币，到底是洞察，还是玩笑？

来源

《经济学人》（The Economist）。