How Does Trade Increase Productivity and Growth?

TL;DR

Trade raises well-being by moving goods to people who value them more and by allowing workers to specialize. Specialization divides knowledge across many people, enabling each person to learn more, increasing society’s combined expertise and productivity. Larger markets, including those created by globalization and waterways, support deeper specialization, industrial improvement, and economic growth.

Transcript

♪ [music] ♪ - [Tyler] In this section of the course, we're going to tackle trade, one of my favorite topics in economics and one of the most fundamental parts of economics. First, we'll cover the big ideas of trade. Why do we trade? What are the advantages of trade? And what is comparative advantage? Later in this section, we'll dive into the micr... Read More

Key Insights

• Trade creates net gains when goods move from people who value them less to people who value them more. Better matching makes both buyers and sellers better off, as illustrated by eBay transferring unwanted attic items to buyers who want them.
• Specialization increases productivity by allowing each person to develop deeper knowledge in a narrower field. Physicians who focus on particular diseases or parts of the body collectively know more and provide better health care than if every physician had to master every specialty.
• The division of knowledge allows society to combine expertise that could never fit within one person’s mind. Because no individual can know everything, distributing different tasks and knowledge across many specialists greatly expands the productive brain power available to an economy.
• Trade makes specialization possible because specialists can exchange their particular services or products for other necessities. An economics teacher can concentrate on economics only because teaching produces a salary that can be traded for food, clothing, shoes, and other goods.
• Developing economies can be poorer partly because they are less specialized. When many workers possess largely similar knowledge, less of society’s total brain power is mobilized, while developed economies use varied specialization to assemble a larger stock of combined knowledge.
• Globalization supports productivity by expanding the scale at which specialization can occur. A worldwide market permits more people to become scientists, engineers, and other specialists, increasing both the number of knowledgeable workers and the depth of the knowledge they develop.
• Waterways promote growth by opening larger markets than land transport alone can provide. Adam Smith observed that industries often begin to subdivide and improve near sea coasts and navigable rivers, where easier trade supports greater specialization and learning.
• Comparative advantage is presented as a separate benefit of trade that will be examined later. The current discussion focuses on gains from differing preferences and on productivity improvements produced through specialization and the division of knowledge.

Questions & Answers

Q: How does trade make buyers and sellers better off?

Trade makes buyers and sellers better off when they value the same good differently. A seller may consider an item to be unwanted junk, while a buyer may value it highly. Moving the item from the seller to that buyer creates a net gain because the seller receives something in exchange and the buyer obtains a desired good. Better matching, as illustrated by eBay, creates value from goods that already exist.

Q: How does specialization increase productivity?

Specialization increases productivity by allowing people to concentrate on narrower tasks and acquire deeper knowledge. Instead of every worker trying to learn everything, different workers master different areas. Their combined knowledge then exceeds what any one person could hold. This greater expertise improves output and supports further learning, so specialists can become more productive and help create goods and services that would otherwise be impossible.

Q: Why is trade necessary for specialization?

Trade is necessary for specialization because a specialist still needs goods and services produced by other people. An economics teacher can focus on studying and teaching economics because those lessons can be exchanged for a salary, which can then purchase food, clothing, and shoes. Without the ability to trade specialized output for other necessities, each person would have to produce far more things independently and could not specialize deeply.

Q: How does medical specialization improve health care?

Medical specialization improves health care by letting physicians learn more about particular areas such as the ear, nose, and throat, heart disease, or breast cancer. If every physician had to master everything known by all other physicians, their total combined knowledge would be smaller. By dividing medical knowledge among specialists, each physician can develop greater expertise, and patients benefit from a much larger collective body of medical knowledge.

Q: Why can less specialization contribute to poverty?

Less specialization can contribute to poverty because many workers may hold similar knowledge rather than developing different forms of expertise. The transcript uses Vietnamese agriculture, where 60% of the labor force still works, as an example. Farmers may know a great deal about farming, but overlapping knowledge means the economy mobilizes a smaller amount of combined knowledge and does not use its available brain power as fully.

Q: How does globalization support specialization and growth?

Globalization supports specialization by expanding the market across which people can exchange their work. When people know they can trade specialized products or services for other goods, they have stronger opportunities to concentrate on distinct fields. At a worldwide scale, this can support more scientists and engineers who know more within their specialties. The resulting increase in combined knowledge raises productivity and contributes to growth.

Q: Why did civilization often develop near coasts and rivers?

Civilization often developed near sea coasts and large navigable rivers because waterways made trade easier and opened larger markets. Adam Smith argued that water transport gave industries access to more buyers and trading partners than land transport alone. Larger markets made specialization easier, and specialization encouraged industries to subdivide, acquire knowledge, and improve. This sequence connected geography, trade, the division of labor, and economic growth.

Q: What does the Star Trek example show about divided knowledge?

The Star Trek example shows why an economy cannot sensibly depend on the knowledge contained in a single brain. Aliens kidnap Mr. Spock and use his brain to run their economy, but even a Vulcan brain is limited compared with everything an economy requires. Dividing tasks and knowledge among many people, then connecting their specialized contributions through trade, gives society far more combined brain power.

Summary & Key Takeaways

• Trade creates value when people have different preferences. A seller can transfer an unwanted item to a buyer who values it more, making both parties better off. Platforms such as eBay improve this matching process, helping society obtain more value from goods that already exist without physically changing those goods.

• Trade also makes specialization possible because specialists can exchange their output or services for everything else they need. Physicians can focus on particular medical fields, while economists can focus on economics. Dividing knowledge across specialists increases society’s combined expertise, productivity, and ability to create goods that would otherwise be impossible.

• Larger markets encourage deeper specialization by giving producers more people with whom they can trade. Adam Smith connected navigable rivers and sea coasts with civilization and growth because water transport expanded markets. Globalization applies the same principle worldwide, supporting more specialized scientists, engineers, industries, and a larger body of combined knowledge.