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International trade is defined as the movement of goods and services between countries. As such, international trade is an example of spatial interaction. International trade occurs when one country purchases goods or services from another country. Why do countries engage in international trade? Why does each country not simply produce all of the goods and services that it requires internally within its own borders? One answer to this question can be found in the writings of David Ricardo, a 19th-century English economist. Ricardo developed the principle of comparative advantage to explain the benefits to be gained by countries from engaging in international trade. According to this principle, a country should produce those products that it is best (most efficient) at producing and export them to other countries. Conversely, a country should import those products that it is less efficient at producing. By specializing in the production of those products that it can produce most efficiently, a country puts its resources (e.g., land, labor) to their optimal use. In a free market economy, the principle of comparative advantage should ensure a global production system whereby goods and services are produced at their optimal locations. The world economic system, however, is not a purely free market, and there are a number of factors (e.g., trade barriers) that distort the pattern of production and trade that might occur under free market conditions.

Patterns of International Trade

In 2000, the total value of goods and services exchanged between countries as a result of international trade was roughly $6.9 trillion. Approximately 80% of this trade involved the exchange of goods, with services accounting for the remaining 20%. Nearly half of merchandise (goods) trade involves office and telecommunications equipment, automotive products, chemicals, food, and fuels. A relatively small number of countries account for the majority of international trade. Indeed, 10 countries—including the United States, Japan, and Western Europe—account for nearly 60% of trade in goods. Most international trade takes place between countries whose economies are highly developed. The United States is the world leader in merchandise trade, accounting for 12% of exports and 18% of imports. The same countries that dominate merchandise trade also dominate international trade in services, with the United States again being the lead exporter and importer.

When a country engages in international trade, it prefers that its exports exceed its imports. When this occurs, international trade generates income for a country. For many countries, however, the value of their imports exceeds the value of their exports. These countries experience what is termed a trade deficit. For example, the 2005 trade deficit of the United States (the excess of imports over exports) exceeded $700 billion. The United States has trade deficits with every one of its major trading partners. During recent years, the size of the U.S. trade deficit with China has grown significantly as the result of China's growing importance as a manufacturing location. China's large population provides it with the world's largest labor force. Chinese manufacturing wages are approximately 2% of what they are in the United States. Today, Americans and Europeans purchase a wide range of products (everything from toys to television sets) that are manufactured in China. Increasing imports into a country are an indication that consumers prefer to purchase goods and services produced in other countries rather than goods and services produced in their own country. This generally occurs when goods and services produced in other countries are cheaper and/or of better quality than domestically produced goods and services. This, however, has serious implications for the economy of the importing country. Falling sales for domestic businesses can result in the need to lay off workers, resulting in higher unemployment levels. When a company (or sometimes a whole industry) sees that its sales are being negatively affected by imports, it often turns to its government for assistance.

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