Interdependence and the Gains from Trade

Interdependence and the Gains from




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onsider your typical day. You wake up in the morning and pour yourself juice from oranges grown in Florida and coffee from beans grown in Brazil. Over breakfast, you watch a news

program broadcast from New York on your television made in China. You get dressed in clothes made of cotton grown in Georgia and sewn in factories in Thailand. You drive to class in a car made of parts manufactured in more than a dozen countries around the world. Then you open up your economics textbook written by an author living in Massachusetts, published by a company located in Ohio, and printed on paper made from trees grown in Oregon.

Every day, you rely on many people, most of whom you have never met, to provide you with the



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goods and services that you enjoy. Such interdependence is possible because people trade with one another. Those people providing you with goods and services are not acting out of generosity. Nor is some government agency directing them to satisfy your desires. Instead,



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PRINTED BY: [email protected] Printing is for personal, private use only. No part of this book may be reproduced or transmitted without publisher’s prior permission. Violators will be prosecuted.

people provide you and other consumers with the goods and services they produce because they get something in return.

In subsequent chapters, we examine how an economy coordinates the activities of millions of people with varying tastes and abilities. As a starting point for this analysis, in this chapter we consider the reasons for economic interdependence. One of the Ten Principles of Economics highlighted in Chapter 1 is that trade can make everyone better off. We now examine this principle more closely. What exactly do people gain when they trade with one another? Why do people choose to become interdependent?

The answers to these questions are key to understanding the modern global economy. Most countries today import from abroad many of the goods and services they consume, and they export to foreign customers many of the goods and services they produce. The analysis in this chapter explains interdependence not only among individuals but also among nations. As we will see, the gains from trade are much the same whether you are buying a haircut from your local barber or a T-shirt made by a worker on the other side of the globe.

3-1 A Parable for the Modern Economy To understand why people choose to depend on others for goods and services and how this choice improves their lives, let’s look at a simple economy. Imagine that there are two goods in the world: meat and potatoes. And there are two people in the world—a cattle rancher named Rose and a potato farmer named Frank—each of whom would like to eat both meat and potatoes.

The gains from trade are most obvious if Rose can produce only meat and Frank can produce only potatoes. In one scenario, Frank and Rose could choose to have nothing to do with each other. But after several months of eating beef roasted, boiled, broiled, and grilled, Rose might decide that self- sufficiency is not all it’s cracked up to be. Frank, who has been eating potatoes mashed, fried, baked, and scalloped, would likely agree. It is easy to see that trade would allow them to enjoy greater variety: Each could then have a steak with a baked potato or a burger with fries.

Although this scene illustrates most simply how everyone can benefit from trade, the gains would be similar if Frank and Rose were each capable of producing the other good, but only at great cost. Suppose, for example, that Rose is able to grow potatoes but her land is not very well suited for it. Similarly, suppose that Frank is able to raise cattle and produce meat but he is not very good at it. In this case, Frank and Rose can each benefit by specializing in what he or she does best and then trading with the other person.

The gains from trade are less obvious, however, when one person is better at producing every good. For example, suppose that Rose is better at raising cattle and better at growing potatoes than Frank. In this case, should Rose choose to remain self-sufficient? Or is there still reason for her to trade with Frank? To answer this question, we need to look more closely at the factors that affect such a decision.

3-1a Production Possibilities Suppose that Frank and Rose each work 8 hours per day and can devote this time to growing potatoes,



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raising cattle, or a combination of the two. The table in Figure 1 shows the amount of time each person requires to produce 1 ounce of



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PRINTED BY: [email protected] Printing is for personal, private use only. No part of this book may be reproduced or transmitted without publisher’s prior permission. Violators will be prosecuted.

each good. Frank can produce an ounce of potatoes in 15 minutes and an ounce of meat in 60 minutes. Rose, who is more productive in both activities, can produce an ounce of potatoes in 10 minutes and an ounce of meat in 20 minutes. The last two columns in the table show the amounts of meat or potatoes Frank and Rose can produce if they devote all 8 hours to producing only that good.

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