📚 Trade Creation and Trade Diversion | 贸易创造与贸易转移
In the study of international economics, customs unions form a key area of analysis. When a group of countries removes trade barriers among themselves but imposes a common external tariff against non-members, two contrasting effects can emerge: trade creation and trade diversion. Understanding these concepts is essential for evaluating whether a regional trade agreement improves or reduces overall welfare.
在国际经济学研究中，关税同盟是一个核心分析领域。当一组国家相互取消贸易壁垒但对非成员国征收共同对外关税时，会产生两种截然相反的效应：贸易创造和贸易转移。理解这些概念对于评估区域贸易协定是增进还是降低整体福利至关重要。
1. Introduction to Customs Unions and Trade Blocs | 关税同盟与贸易集团简介
A customs union is a type of preferential trade arrangement in which member countries abolish all trade barriers (such as tariffs and quotas) between themselves and adopt a common external tariff (CET) on imports from non-members. This differs from a free trade area, where members maintain their own external tariffs against the rest of the world. Examples include the European Union (which started as a customs union) and the Southern Common Market (MERCOSUR).
关税同盟是一种优惠贸易安排，成员国之间取消所有贸易壁垒（如关税和配额），并对来自非成员的进口实行共同对外关税（CET）。这与自由贸易区不同，后者的成员国仍各自对世界其他地区征收不同的外部关税。例子包括欧洲联盟（最初为关税同盟）和南方共同市场（MERCOSUR）。
Because a customs union discriminates between member and non-member countries, it can alter trade patterns in ways that may either enhance or reduce global efficiency. The two key concepts introduced by Jacob Viner in 1950 are trade creation and trade diversion.
由于关税同盟对成员和非成员国家区别对待，它可能以增进或降低全球效率的方式改变贸易格局。雅各布·维纳（Jacob Viner）于1950年提出的两个关键概念是贸易创造和贸易转移。
2. Defining Trade Creation | 贸易创造的定义
Trade creation occurs when the formation of a customs union leads to a shift in domestic consumption from a high-cost domestic producer to a lower-cost partner country producer. Before the union, a country might have imposed a tariff on imports, making the domestic price of a good higher than the partner's cost of production. After removing internal tariffs, consumers benefit from lower prices and increased consumption, while inefficient domestic production is replaced by more efficient imports from the partner. This improves resource allocation and increases welfare for the import-competing sector.
贸易创造发生在关税同盟成立后，国内消费从高成本的国内生产者转向低成本的伙伴国生产者。结盟前，一国可能对进口征收关税，使得商品的国内价格高于伙伴国的生产成本。消除内部关税后，消费者受益于更低的价格和增加的消费，而低效的国内生产则被伙伴国更高效的进口所取代。这改善了资源配置，增加了进口竞争部门的福利。
In terms of welfare analysis, trade creation generates a net gain to the importing country. The increase in consumer surplus outweighs the loss of producer surplus and the forgone tariff revenue. Hence, trade creation is considered a beneficial outcome of regional integration.
从福利分析的角度看，贸易创造为进口国带来净收益。消费者剩余的增加超过了生产者剩余的损失和放弃的关税收入。因此，贸易创造被视为区域一体化带来的有利结果。
3. Defining Trade Diversion | 贸易转移的定义
Trade diversion takes place when, upon joining a customs union, a country replaces imports from a more efficient non-member producer with imports from a less
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