📚 The Role of Trade, Investment, Multinationals and Foreign Direct Investment | 贸易、投资、跨国公司与外国直接投资的作用
International trade and cross-border investment are central to Cambridge A-Level Economics because they explain how economies link through flows of goods, services, capital and technology. This article examines why countries trade, the different forms of foreign investment, and how multinational corporations and foreign direct investment affect host and home economies.
国际贸易和跨境投资是剑桥A-Level经济学的核心内容，因为它们解释了各经济体如何通过商品、服务、资本和技术流动相互联系。本文考察了国家为何开展贸易、外国投资的不同形式，以及跨国公司和外国直接投资如何影响东道国和母国经济。
1. The Basis of Trade: Comparative Advantage | 贸易的基础：比较优势
Trade arises because factor endowments and productivity differ across countries. The principle of comparative advantage states that a country should specialise in producing goods with the lowest opportunity cost, even if another country is absolutely more efficient in everything.
贸易的产生是因为各国的要素禀赋和生产率不同。比较优势原理指出，一国应该专门生产机会成本最低的商品，即使另一国在所有商品上都拥有绝对效率优势。
A simple two-country, two-good example illustrates the gains from specialisation. Suppose one worker in Country A can produce 40 units of wheat or 20 units of cloth, while one worker in Country B can produce 10 units of wheat or 15 units of cloth. Country A has an absolute advantage in wheat, but its opportunity cost of 1 unit of cloth is 2 wheat, while Country B’s opportunity cost of 1 unit of cloth is 0.67 wheat. Country B has a comparative advantage in cloth.
一个简单的两国两商品例子可以说明专业化的收益。假设A国一个工人可以生产40单位小麦或20单位布，而B国一个工人可以生产10单位小麦或15单位布。A国在小麦上拥有绝对优势，但1单位布的机会成本是2单位小麦，而B国1单位布的机会成本是0.67单位小麦。因此，B国在布上拥有比较优势。
2. Gains from Trade and Economic Welfare | 贸易收益与经济福利
Free trade enables a country to consume beyond its production possibility frontier by importing goods that are relatively expensive to produce domestically. It also increases competition, lowers prices, widens consumer choice and encourages efficiency.
自由贸易通过进口国内生产成本相对较高的商品，使一国能够超越其生产可能性边界进行消费。它还加强了竞争、降低了价格、扩大了消费者选择并鼓励效率提升。
Trade can stimulate economic growth through export-led demand, job creation in export sectors, and access to larger markets that allow firms to exploit economies of scale. However, gains are not evenly distributed; workers in import-competing industries may lose jobs in the short run.
贸易可以通过出口导向型需求、出口部门就业创造以及进入更大市场使企业实现规模经济来刺激经济增长。然而，收益并非平均分配；进口竞争行业的工人在短期内可能失业。
3. Investment and Foreign Direct Investment Defined | 投资与外国直接投资的定义
Investment is spending on capital goods that increases productive capacity. Foreign investment is divided into portfolio investment, which buys financial assets without control, and foreign direct investment (FDI), where an investor establishes a lasting interest and significant influence in a foreign enterprise.
投资是用于增加生产能力的资本品支出。外国投资分为证券投资和外国直接投资(FDI)：证券投资购买金融资产但不取得控制权，而FDI是投资者在外国企业中建立持久利益并施加重大影响。
The IMF conventionally defines FDI as owning at least 10% of voting shares. FDI involves not only capital but also technology, management, brands and access to global supply chains.
国际货币基金组织通常将拥有至少10%表决权的投资定义为FDI。FDI不仅涉及资本，还涉及技术、管理、品牌和进入全球供应链的渠道。
4. Types of Foreign Direct Investment | 外国直接投资的类型
FDI can be classified by direction and by strategy. Greenfield FDI builds new production facilities, while brownfield FDI acquires or merges with existing firms. Horizontal FDI duplicates the same stage of production abroad; vertical FDI moves a different stage to another country.
FDI可以按方向和战略分类。绿地FDI新建生产设施，而棕地FDI收购或合并现有企业。水平型FDI在国外复制同一生产阶段；垂直型FDI将不同生产阶段转移到另一国。
- Greenfield: full control, more jobs, but longer to start. / 绿地投资：完全控制、更多就业，但启动时间较长。
- Brownfield: faster entry, existing market share, but possible legacy costs. / 棕地投资：进入更快、已有市场份额，但可能产生遗留成本。
- Horizontal: serving foreign markets locally. / 水平型：在当地服务外国市场。
- Vertical: splitting supply chain to reduce costs. / 垂直型
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