📚 Policies to Correct Balance of Payments Disequilibrium | 纠正国际收支失衡的政策
This revision note explains the main policies used to correct a balance of payments disequilibrium, particularly a current account deficit. It separates policies into expenditure-reducing and expenditure-switching measures, adds supply-side reforms, and evaluates their effectiveness for Cambridge A-Level Economics.
本复习笔记解释用于纠正国际收支失衡，尤其是经常账户赤字的主要政策。文章将政策分为支出减少和支出转换措施，补充供给侧改革，并结合剑桥 A-Level 经济学评估其有效性。
1. The Nature of Balance of Payments Disequilibrium | 国际收支失衡的性质
A balance of payments disequilibrium is a persistent current account deficit or surplus that cannot be financed without large official borrowing or reserve movements. For most A-Level exam questions, the focus is a current account deficit: import spending exceeds export earnings, so a country is absorbing more than it produces. Correction policies aim to reduce the external deficit while preserving internal objectives such as full employment, price stability and economic growth.
国际收支失衡是指经常账户持续出现赤字或盈余，因而不得不依靠大量官方借款或储备变动来融资。对大多数 A-Level 考题而言，重点是经常账户赤字：进口支出大于出口收入，即一国吸收超过了本国产出。纠正政策的目标是减少外部赤字，同时尽可能保住充分就业、物价稳定和经济增长等内部目标。
2. Expenditure-Reducing Policies: Fiscal Contraction | 支出减少政策：财政紧缩
Expenditure-reducing policies work through lower aggregate demand. Since imports are a positive function of income, cutting government spending or raising taxes reduces household and government spending, so fewer imported goods are bought. The AD identity shows the link:
支出减少政策通过降低总需求发挥作用。由于进口是收入的正函数，削减政府支出或增税会减少居民和政府支出，从而减少进口商品购买。总需求恒等式显示了这一联系：
AD = C + I + G + (X − M)
A smaller C or G lowers M, improving the trade balance. However, fiscal tightening can push the economy into recession, raise unemployment and reduce tax revenue. It is most suitable when the deficit is caused by domestic overheating rather than by structural weakness in export supply.
C 或 G 减少会使 M 下降，从而改善贸易差额。但财政紧缩可能使经济陷入衰退、推高失业并减少税收收入。当赤字由国内过热引起，而不是由出口供给的结构性疲弱引起时，这种政策最适用。
3. Expenditure-Reducing Policies: Monetary Tightening | 支出减少政策：货币紧缩
Monetary contraction raises the policy interest rate, which increases the cost of borrowing. Consumption and investment fall, imports fall, and the current account may improve. A higher interest rate can also attract short-term capital inflows, strengthening the financial account. But the induced exchange rate appreciation can make exports less competitive and imports cheaper, partly offsetting the improvement.
货币紧缩提高政策利率，从而增加借贷成本。消费和投资下降，进口减少，经常账户可能改善。较高的利率还可能吸引短期资本流入，增强金融账户。但由此引起的汇率升值会降低出口竞争力并使进口更便宜，部分抵消经常账户的改善。
Monetary tightening is therefore a double-edged instrument. It can reduce domestic demand for imports and attract capital, but the exchange rate effect may worsen the current account. This policy is often more suitable for stopping capital flight than for correcting a structural trade deficit.
因此，货币紧缩是一把双刃剑。它可以减少国内进口需求并吸引资本，但汇率效应可能使经常账户恶化。这一政策往往更适合阻止资本外逃，而不太适合纠正结构性贸易赤字。
4. Expenditure-Switching Policies: Exchange Rate Depreciation | 支出转换政策：汇率贬值
Expenditure-switching policies change relative prices between domestic and foreign goods. A depreciation of the currency makes exports cheaper in foreign currency and imports more expensive in domestic currency. Households and firms switch spending toward home-produced goods, raising X and lowering M. Under a fixed exchange rate, this is achieved by devaluation; under a floating rate, by depreciation.
支出转换政策改变本国商品与外国商品的相对价格。本币贬值使出口以外币计价更便宜，进口以本币计价更昂贵。家庭和企业把支出转向本国生产的商品，X 上升、M 下降。在固定汇率制下，这一操作称为法定贬值；在浮动汇率制下，则表现为市场贬值。
The main advantage is that depreciation can improve the current account without necessarily cutting domestic output. However, it raises the domestic price of imported goods and imported inputs, so it may cause cost-push inflation, especially in a small open economy heavily dependent on imports.
贬值的主要优点是可以在不必然削减国内产出的情况下改善经常账户。但贬值会提高进口商品和进口投入品的本币价格，因此可能引发成本推动型通胀，在高度依赖进口的小型开放经济中尤其明显。
5. The Marshall-Lerner Condition and the J-Curve Effect | 马歇尔-勒纳条件与 J 曲线效应
The success of depreciation depends on price elasticities of demand for exports and imports. The Marshall-Lerner condition states that depreciation improves the trade balance only if:
贬值能否成功取决于出口和进口的需求价格弹性。马歇尔-勒纳条件指出，只有满足以下条件，贬值才能改善贸易差额：
|PEDₓ + PEDₘ| > 1
If the sum of the absolute elasticities is greater than one, the volume response is strong enough to outweigh the lower export price and higher import unit cost. If the sum is less than one, depreciation worsens the trade balance.
如果两个弹性绝对值之和大于 1，数量反应就足够强，可以抵消出口价格下降和进口单位成本上升的影响。如果弹性之和小于 1，贬值反而会使贸易差额恶化。
Empirically, the improvement often follows a J-curve. In the short run, existing contracts, low elasticities and slow consumer adjustment may worsen the trade balance after depreciation. Only after several quarters or years do export volumes rise and import volumes fall enough to produce an improvement.
从经验看，改善往往呈 J 曲线形态。短期内，由于既有合同、弹性较低以及消费者调整缓慢，贬值后贸易差额可能先恶化。只有在几个季度或几年之后，出口量和进口量才会充分反应，带来贸易收支改善。
6. Expenditure-Switching Policies: Tariffs and Import Quotas | 支出转换政策：关税与进口配额
Governments can use trade barriers to switch expenditure directly. A tariff is a tax on imported goods, raising their domestic price and reducing quantity demanded. An import quota sets a physical limit on the quantity of a good that may enter the country, making supply scarcer and pushing up price. Both reduce import volume and may improve the current account in the short run.
政府可以使用贸易壁垒直接转换支出。关税是对进口商品征收的税，提高其国内价格并减少需求量。进口配额对允许进入本国的商品数量设置物理上限，使供给减少、价格上升。两者都会减少进口量，并可能在短期内改善经常账户。
| Policy | 政策 | Mechanism | 机制 | Main Risk | 主要风险 |
|---|---|---|
| Tariff | 关税 | Raises import price | 提高进口价格 | Retaliation, cost-push inflation | 报复、成本推动通胀 |
| Quota | 配额 | Restricts import quantity | 限制进口数量 | Shortages, rent-seeking | 短缺、寻租 |
Tariffs raise government revenue, while quotas may create quota rents for licence holders. However, protection can trigger retaliation from trading partners, raise costs for firms using imported inputs, reduce competitive pressure, and violate WTO commitments. They are therefore often attacked as a second-best and temporary correction method.
关税增加政府收入，而配额可能为许可证持有者创造配额租金。但贸易保护可能招致贸易伙伴报复、提高使用进口投入品企业的成本、削弱竞争压力，并违反世贸组织承诺。因此它们常被视为次优、临时性的纠正手段。
7. Expenditure-Switching Policies: Export and Production Subsidies | 支出转换政策：出口与生产补贴
An export subsidy lowers the cost of exporting, allowing domestic producers to sell abroad at a lower price or earn higher margins. A domestic production subsidy reduces
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