📚 The Relationship between the Balance of Payments and Inflation | 国际收支与通货膨胀的关系
Understanding how the balance of payments and inflation interact is central to Cambridge A-Level Economics. A country’s current account position, its exchange rate and its domestic price level do not move independently: higher inflation can erode export competitiveness and widen a trade deficit, while a current account deficit can put downward pressure on the currency and feed imported cost-push inflation. This article examines the key transmission channels, conditions and policy trade-offs.
理解国际收支与通货膨胀之间的相互作用是剑桥 A-Level 经济学的核心内容。一国的经常账户状况、汇率和国内物价水平并不是独立变动的：较高的通胀会侵蚀出口竞争力并扩大贸易赤字，而经常账户赤字又可能对货币产生贬值压力，并引发输入性成本推动型通胀。本文考察其主要传导渠道、条件和政策权衡。
1. Defining the Balance of Payments | 国际收支的定义
The balance of payments (BoP) is a systematic record of all economic transactions between residents of a country and the rest of the world over a given period. It comprises the current account, the capital account and the financial account. The current account records trade in goods, trade in services, primary income such as profits, interest and dividends, and secondary income such as foreign aid and remittances.
国际收支是一国居民与世界其他国家居民在一定时期内所有经济交易的系统记录。它由经常账户、资本账户和金融账户组成。经常账户记录货物贸易、服务贸易、利润、利息和股息等初次收入，以及外国援助和侨汇等二次收入。
A current account deficit means a country is spending more on imports, investment income and transfers than it earns from exports, investment income and transfers. It must be financed by a surplus on the financial account through borrowing, selling assets or running down official reserves.
经常账户赤字意味着一国在进口、投资收入和转移支付上的支出大于其从出口、投资收入和转移支付中获得的收入。它必须通过金融账户盈余来融资，例如借款、出售资产或动用官方储备。
2. Defining Inflation and Its Main Causes | 通货膨胀的定义及其主要成因
Inflation is a sustained rise in the general price level over time. The two main types at A-Level are demand-pull inflation, caused by excessive aggregate demand relative to full-employment output, and cost-push inflation, caused by rising production costs such as wages, raw materials, energy or imported inputs.
通货膨胀是指一般物价水平在一段时间内持续上升。A-Level 中的两种主要类型是需求拉动型通货膨胀和成本推动型通货膨胀。需求拉动型通货膨胀是由总需求相对于充分就业产出过度增长引起的；成本推动型通货膨胀是由工资、原材料、能源或进口投入品等生产成本上升引起的。
Because many economies are highly open, imported inflation matters: a depreciation of the exchange rate raises the domestic-currency price of imported goods and services, feeding directly into the consumer price index and into firms’ costs.
由于许多经济体高度开放，输入性通货膨胀非常重要：汇率贬值会提高进口商品和服务的本币价格，直接推高消费者价格指数并增加企业成本。
3. Price Competitiveness and the Current Account | 价格竞争力与经常账户
If a country’s inflation rate is persistently higher than that of its trading partners, its exports become relatively more expensive in foreign currency, while foreign goods become relatively cheaper for domestic consumers. This reduces export volume and increases import volume, ceteris paribus, worsening the current account.
如果一国的通货膨胀率持续高于其贸易伙伴，其出口商品以外币计价会变得相对更贵，而外国商品对本国消费者来说则相对更便宜。在其他条件不变的情况下，这会减少出口量并增加进口量，从而使经常账户恶化。
The strength of this effect depends on the price elasticity of demand for exports and imports. If demand is price elastic, a given loss of price competitiveness leads to a proportionately larger fall in export revenue and rise in import spending, so the trade balance deteriorates more sharply.
这种效应的强弱取决于出口和进口的需求价格弹性。如果需求富有价格弹性，价格竞争力的下降会导致出口收入按更大比例减少、进口支出按更大比例增加，因此贸易差额会恶化得更明显。
4. Inflation Differentials and the Exchange Rate | 通胀差异与汇率
Under a floating exchange rate, inflation differentials influence the nominal exchange rate. The theory of purchasing power parity (PPP) suggests that a country with higher inflation should experience a depreciation of its currency over time to restore relative price levels. For example, if the UK inflation rate is 5% and the euro area inflation rate is 2%, the pound would tend to depreciate against the euro by about 3% per year, other things equal.
在浮动汇率制下，通胀差异会影响名义汇率。购买力平价理论认为，通货膨胀率较高的国家，其货币应随着时间推移而贬值，以恢复相对价格水平。例如，如果英国通胀率为 5%，欧元区通胀率为 2%，在其他条件相同的情况下，英镑兑欧元每年可能贬值约 3%。
However, in the short run exchange rates are also driven by interest rate expectations and capital flows. If higher inflation forces the central bank to raise interest rates, the currency may appreciate despite the inflation differential, because higher yields attract short-term capital.
然而，在短期内汇率还受到利率预期和资本流动的影响。如果较高的通胀迫使中央银行提高利率，货币可能因高收益率吸引短期资本而升值，尽管存在通胀差异。
5. Current Account Deficit, Depreciation and Imported Inflation | 经常账户赤字、贬值与输入性通胀
A current account deficit means the demand for foreign currency to pay for imports exceeds the supply of foreign currency earned from exports. Under a floating exchange rate, this downward pressure on the domestic currency can cause depreciation. Depreciation raises the price of imported final goods and imported raw materials, energy and intermediate components, leading to cost-push inflation.
经常账户赤字意味着用于支付进口的外汇需求超过出口赚取的外汇供给。在浮动汇率制下，这种对本币的下行压力会导致贬值。贬值会提高进口最终产品以及进口原材料、能源和中间零部件的价格，从而导致成本推动型通货膨胀。
A depreciation may initially worsen the trade balance before it improves, because import and export volumes adjust slowly while prices change immediately. This is the J-curve effect. During the initial period, the inflationary impact from higher import prices can occur even before the current account improves.
贬值在改善贸易差额之前，可能先使其恶化，因为进出口数量的调整缓慢，而价格会立即变化。这就是 J 曲线效应。在初期阶段，进口价格上涨带来的通胀影响可能在经常账户改善之前就已经出现。
6. The Marshall-Lerner Condition and Real Effects | 马歇尔-勒纳条件与实际效应
For a depreciation to improve the current account eventually, the Marshall-Lerner condition must hold: the sum of the price elasticities of demand for exports and imports must be greater than one in absolute value. If the condition is not met, depreciation may worsen the trade balance and still raise import prices, creating stagflationary pressure: higher inflation with little or no improvement in the external balance.
要使贬值最终改善经常账户，必须满足马歇尔-勒纳条件：出口和进口需求价格弹性之和的绝对值必须大于 1。如果不满足该条件，贬值可能使贸易差额恶化，同时仍会推高进口价格，从而产生滞胀压力：通胀上升，而外部平衡几乎没有改善。
This is why a balance of payments deficit can be associated with inflation without a quick automatic correction. The economy may import inflation through currency weakness while the volume response remains weak in the short run.
这就是国际收支赤字可能伴随通胀而不会迅速自动纠正的原因。经济可能通过货币疲软输入通胀，而短期内数量反应仍然较弱。
7. Balance of Payments Surplus and Demand-Pull Inflation | 国际收支顺差与需求拉动型通胀
A current account surplus means export revenue exceeds import spending, so net exports (X-M) are positive and add to aggregate demand. If the economy is already near full employment, a persistent surplus can contribute to demand-pull inflation because the external sector is injecting spending without a matching increase in domestic output capacity.
经常账户顺差意味着出口收入超过进口支出，因此净出口（X-M）为正并增加总需求。如果经济体已经接近充分就业，持续的顺差可能导致需求拉动型通胀，因为外部部门在增加支出，而国内产出能力未能相应提高。
Under a fixed exchange rate, a payments surplus also creates upward pressure on the domestic currency. To maintain the fixed parity, the central bank may buy foreign currency and sell domestic currency, increasing the domestic money supply unless it sterilises the intervention. A larger money supply can further fuel demand-pull inflation.
在固定汇率制下，国际收支顺差还会对本币产生升值压力。为了维持固定平价，中央银行可能买入外汇并卖出本币，从而增加国内货币供应量，除非它对外汇干预进行冲销。货币供应量增加会进一步助长需求拉动型通胀。
8. Capital and Financial Account Flows and Inflation | 资本与金融账户流动与通胀
Large capital inflows can affect inflation through the exchange rate and asset prices. If a country attracts foreign direct investment or portfolio inflows, its currency may appreciate, which lowers import prices and reduces imported inflation. However, capital inflows can also increase domestic liquidity and demand for assets, housing and consumer goods, potentially adding to inflationary pressure.
大规模资本流入可以通过汇率和资产价格影响通胀。如果一国吸引外国直接投资或证券投资流入，其货币可能升值，从而降低进口价格并减轻输入性通胀。然而，资本流入也可能增加国内流动性和对资产、住房及消费品的需求，从而可能增加通胀压力。
If the central bank intervenes to prevent appreciation by buying foreign currency, the resulting increase in the money supply can be inflationary.
Published by TutorHao | A-Level Economics Revision Series | aleveler.com
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