📚 The Balance of Payments | 国际收支平衡
The balance of payments is one of the most important macroeconomic accounts for any open economy. It records all transactions between residents of a country and the rest of the world over a given period, usually one year. For Cambridge A-Level Economics, students need to understand its structure, the meaning of current account deficits and surpluses, and the policies used to correct imbalances.
国际收支平衡表是开放经济体中最重要的宏观经济账户之一。它记录了一国居民与世界其他国家在某一时期内（通常为一年）发生的全部交易。对于剑桥A-Level经济课程，学生需要理解其结构、经常账户赤字与盈余的含义，以及纠正失衡的政策。
1. Definition and Structure | 定义与结构
The balance of payments (BOP) is a systematic record of all economic transactions between the residents of a country and the rest of the world in a given time period. It is divided into the current account, the capital and financial account, and the net errors and omissions. Because the accounts use double-entry bookkeeping, in theory the total sum should be zero.
国际收支平衡表是一国居民与世界其他国家在一定时期内全部经济交易的系统记录。它分为经常账户、资本与金融账户以及净误差与遗漏。由于账户采用复式记账法，理论上总和应为零。
Residents include households, firms and government, not necessarily individuals of that nationality. Recorded transactions include trade in goods and services, income flows, current transfers, and financial flows such as borrowing, lending and asset purchases.
居民包括家庭、企业和政府，不一定按国籍划分。记录的交易包括货物和服务贸易、收入流动、经常转移以及借款、贷款和资产购买等金融流动。
2. The Current Account | 经常账户
The current account records flows of goods, services, primary income and secondary income. The trade in goods balance is the difference between visible exports and visible imports. The trade in services covers transport, tourism, insurance and financial services.
经常账户记录货物、服务、初级收入和次级收入的流动。货物贸易差额是可见出口与可见进口之差。服务贸易包括运输、旅游、保险和金融服务。
Primary income includes wages, interest, profits and dividends earned abroad minus those paid to foreigners. Secondary income includes current transfers such as foreign aid, remittances and contributions to international organisations, which involve no quid pro quo.
初级收入包括从国外获得的工资、利息、利润和股息减去支付给外国人的部分。次级收入包括经常转移，如对外援助、侨汇和对国际组织的缴款，这些转移不要求对等回报。
A current account deficit means that the value of outflows from these four components exceeds inflows. It implies that the nation is spending more on foreign goods, services and income than it earns abroad.
经常账户赤字意味着这四个组成部分的流出价值大于流入。它表明一国对外国商品、服务和收入的支出超过了它从国外获得的收入。
3. The Capital and Financial Account | 资本与金融账户
The capital account records capital transfers and the acquisition or disposal of non-produced, non-financial assets, such as copyrights and land sold to embassies. The financial account records transactions in financial assets and liabilities: direct investment, portfolio investment, other investment and reserve assets.
资本账户记录资本转移和非生产、非金融资产的取得或处置，例如版权和出售给使馆的土地。金融账户记录金融资产和负债的交易：直接投资、证券投资、其他投资和储备资产。
Foreign direct investment (FDI) involves acquiring a lasting interest and control, usually at least 10% of equity. Portfolio investment includes purchases of shares and bonds that do not give control. Other investment covers loans, trade credit and currency deposits.
外国直接投资涉及获得持久利益和控制权，通常至少持有10%的股权。证券投资包括购买不赋予控制权的股票和债券。其他投资涵盖贷款、贸易信贷和货币存款。
When a country runs a current account deficit, it must be financed by a net inflow on the financial account, such as by selling assets to foreigners or by borrowing. This is why the two accounts are mirror images in accounting terms.
当一国出现经常账户赤字时，必须通过金融账户的净流入来融资，例如向外国人出售资产或借款。这就是为什么在会计意义上两个账户互为镜像。
4. The Balancing Item and Double-Entry Principle | 净误差与遗漏及复式记账原则
In practice, statistics are collected from thousands of separate sources, so measurement errors occur. The net errors and omissions item is added to make the accounts sum to zero. A large persistent balancing item may indicate unrecorded capital flight or smuggling.
在实践中，统计数据来自成千上万个不同的来源，因此会产生测量误差。加入净误差与遗漏项是为了使账户总和为零。持续较大的平衡项目可能表明存在未记录的资本外逃或走私。
Each transaction is recorded twice: for example, an export of goods is credited in the current account and the receipt of foreign currency is recorded in the financial account. Thus the balance of payments identity can be written as: current account + capital and financial account + net errors and omissions = 0.
每笔交易记录两次：例如，货物出口在经常账户中贷记，收到外币则记录在金融账户中。因此国际收支恒等式可以写作：经常账户 + 资本与金融账户 + 净误差与遗漏 = 0。
5. Interpreting a Current Account Deficit | 解释经常账户赤字
A current account deficit is not automatically harmful. It may reflect an economy investing productively with capital imported from abroad. However, analysts examine whether the deficit is used to finance consumption or investment, and whether it is sustainable.
经常账户赤字不必然有害。它可能反映一个经济体利用从国外进口的资本进行生产性投资。但分析者会考察赤字是用于消费还是投资，以及是否可持续。
A useful way to express the deficit is as a share of GDP. A small deficit of 1-2% of GDP may be easily financed, while a deficit above 5% may draw market concern, especially if it persists.
表达赤字的一个有用方法是把它表示为GDP的比重。占GDP 1-2%的小额赤字可能容易融资，而超过5%的赤字可能引起市场担忧，尤其是持续存在时。
The deficit also mirrors the saving-investment gap. Using the identity CA = S – I + (T – G), a current account deficit may be caused by low private saving, high investment, or a fiscal deficit.
赤字也反映了储蓄-投资缺口。根据恒等式 CA = S – I + (T – G)，经常账户赤字可能由低私人储蓄、高投资或财政赤字引起。
6. Causes of a Current Account Deficit | 经常账户赤字的原因
A current account deficit may be caused by strong domestic demand, which pulls in imports. If real incomes grow faster than productivity, consumers and firms buy more from abroad. This is often called demand-side pressure.
经常账户赤字可能由强劲的国内需求引起，这会拉动进口。如果实际收入增长快于生产率，消费者和企业就会从国外购买更多商品。这通常被称为需求侧压力。
A loss of price or non-price competitiveness can also cause deficits. If domestic inflation is higher than trading partners or productivity growth is weaker, exports become less competitive and imports more attractive.
价格或非价格竞争力的丧失也可能导致赤字。如果国内通胀高于贸易伙伴或生产率增长较弱，出口将变得缺乏竞争力，进口则更具吸引力。
An overvalued exchange rate makes exports more expensive abroad and imports cheaper at home, worsening the current account. Structural factors such as a lack of domestic capacity in certain goods or reliance on imported raw materials also matter.
汇率高估使出口在国外更贵、进口在国内更便宜，从而恶化经常账户。结构性因素，例如某些商品缺乏国内产能或依赖进口原材料，也很重要。
7. Consequences of a Persistent Current Account Deficit | 持续经常账户赤字的后果
A moderate current account deficit can be sustainable if it finances productive investment that raises future export capacity. However, a persistent deficit may lead to rising external debt, higher interest payments abroad and a growing net international liability position.
适度的经常账户赤字如果用于资助能提高未来出口能力的生产性投资，则可能是可持续的。然而，持续赤字可能导致外债上升、对外利息支付增加以及净国际负债头寸扩大。
If markets lose confidence in a country with a large deficit, there may be capital outflows, a sharp depreciation and higher borrowing costs. In extreme cases, a currency crisis can occur, as seen in several emerging markets.
如果市场对拥有巨额赤字的国家失去信心，就可能出现资本外流、汇率急剧贬值和借款成本上升。在极端情况下，可能发生货币危机，正如若干新兴市场曾出现的那样。
For an economy in recession, a current account deficit also represents a leakage of aggregate demand from the circular flow of income, which may reduce domestic output and employment.
对于处于衰退中的经济体，经常账户赤字也代表总需求从收入循环流中漏出，这可能会减少国内产出和就业。
8. Policies to Reduce a Current Account Deficit | 减少经常账户赤字的政策
Expenditure-reducing policies reduce aggregate demand and therefore demand for imports. Higher interest rates, tighter fiscal policy or higher taxes lower household and firm spending. However, these policies may reduce output and raise unemployment.
支出削减政策降低总需求，从而减少对进口的需求。提高利率、收紧财政政策或提高税收会降低家庭和企业支出。但这些政策可能减少产出并增加失业。
Expenditure-switching policies redirect spending from foreign goods to domestic goods. A depreciation of the exchange rate makes imports more expensive and exports cheaper, while import tariffs or quotas directly restrict foreign purchases.
支出转换政策将支出从外国商品转向国内商品。汇率贬值使进口更贵、出口更便宜，而进口关税或配额直接限制对外国商品的购买。
Supply-side policies aim to raise productivity, innovation and productive capacity so that domestic firms can produce goods that consumers would otherwise import. Examples include investment in education, infrastructure, R&D and labour market reforms.
供给侧政策旨在提高生产率、创新和生产能力，使国内企业能够生产消费者本来会进口的商品。例子包括对教育、基础设施、研发的投资和劳动力市场改革。
Protectionist measures may reduce imports quickly, but they invite retaliation, distort resource allocation and may violate WTO rules. They are usually considered a last resort rather than a long-term cure.
保护主义措施可能迅速减少进口，但会招致报复、扭曲资源配置，并可能违反世界贸易组织规则。它们通常被视为最后手段，而非长期解决办法。
9. The Marshall-Lerner Condition and the J-Curve | 马歇尔-勒纳条件与J曲线
A depreciation improves the current account only if the Marshall-Lerner condition holds: the sum of the price elasticities of demand for exports and imports must be greater than one.
只有在马歇尔-勒纳条件成立时，贬值才能改善经常账户：出口和进口需求的价格弹性之和必须大于1。
|PED exports| + |PED imports| > 1
If the condition is satisfied, a depreciation raises export revenue and reduces import spending. In the short run, however, quantities may adjust slowly because contracts are fixed and consumers need time to switch suppliers. The current account may worsen before it improves, tracing a J-curve.
如果条件满足，贬值会提高出口收入并减少进口支出。但在短期内，由于合同固定、消费者转换供应商需要时间，数量调整缓慢。经常账户可能先恶化后改善，形成J曲线。
Empirical estimates suggest that for many advanced economies the Marshall-Lerner condition holds in the medium term, but elasticities are lower in the short run. The J-curve is therefore an important time-lag effect in policy evaluation.
实证估计表明，许多发达经济体在中期满足马歇尔-勒纳条件，但短期内弹性较低。因此，J曲线是政策评估中重要的时滞效应。
10. Evaluating Deficits, Surpluses and Policy Trade-offs | 评价赤字、盈余与政策权衡
A current account surplus is not always a sign of strength. It may reflect weak domestic consumption, high saving caused by insecurity, or an undervalued exchange rate. Some large economies have been criticised for relying heavily on external demand.
经常账户盈余并不总是实力的标志。它可能反映国内消费疲软、因缺乏安全感导致的高储蓄或汇率低估。一些大型经济体曾被批评过度依赖外部需求。
Deficits and surpluses must be assessed in context. A deficit caused by productive investment under political stability may be more sustainable than a surplus caused by depressed consumer spending
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