Book cover for Macroeconomics

Macroeconomics

Paul Krugman, Robin Wells

ISBN #9781464110375

4th Edition

265 Questions

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Homework Questions

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Summary
Learning Objectives
Key Concepts
Example Problems
Explanations
Common Mistakes

Summary

This chapter emphasizes that international trade is fundamentally driven by comparative advantage, where countries benefit from specializing in goods they produce most efficiently. The Ricardian and Heckscher–Ohlin models illustrate how differences in productivity and factor endowments can lead to enhanced overall production and consumption. While trade generally boosts economic welfare, it also results in redistributional effects, with some domestic sectors facing challenges. Additionally, trade policies such as tariffs and quotas, while protecting certain industries, often introduce inefficiencies and deadweight losses.

Learning Objectives

1

Explain the principle of comparative advantage and its role in international trade.

2

Analyze the Ricardian and Heckscher–Ohlin models to understand how specialization increases overall output.

3

Evaluate the redistributional effects of trade, including the impacts on import-competing industries and exporting sectors.

4

Assess the effects of trade policies such as tariffs and import quotas on economic efficiency.

Key Concepts

CONCEPT

DEFINITION

Comparative Advantage

The ability of a country to produce a good at a lower opportunity cost compared to other nations, which drives specialization and gains from trade.

Opportunity Cost

The cost of forgoing the next best alternative when making a decision about resource allocation.

Ricardian Model

A trade model that explains international trade based on differences in labor productivity and opportunity costs between countries.

Heckscher–Ohlin Model

A trade theory that emphasizes the role of countries' factor endowments (like labor and capital) in determining comparative advantage and trade patterns.

Trade Policies

Regulations such as tariffs and import quotas that governments implement to protect domestic industries, which can lead to inefficiencies and deadweight loss.

Example Problems

Example 1

Both Canada and the United States produce lumber and footballs with constant opportunity costs. The United States can produce either 10 tons of lumber and no footballs, or 1,000 footballs and no lumber, or any combination in between. Canada can produce either 8 tons of lumber and no footballs, or 400 footballs and no lumber, or any combination in between. a. Draw the U.S. and Canadian production possibility frontiers in two separate diagrams, with footballs on the horizontal axis and lumber on the vertical axis. b. In autarky, if the United States wants to consume 500 footballs, how much lumber can it consume at most? Label this point $A$ in your diagram. Similarly, if Canada wants to consume 1 ton of lumber, how many footballs can it consume in autarky? Label this point $C$ in your diagram. c. Which country has the absolute advantage in lumber production? d. Which country has the comparative advantage in lumber production? Suppose each country specializes in the good in which it has the comparative advantage, and there is trade. e. How many footballs does the United States produce? How much lumber does Canada produce? f. Is it possible for the United States to consume 500 footballs and 7 tons of lumber? Label this point $B$ in your diagram. Is it possible for Canada at the same time to consume 500 footballs and 1 ton of lumber? Label this point $D$ in your diagram.

Example 2

For each of the following trade relationships, explain the likely source of the comparative advantage of each of the exporting countries. a. The United States exports software to Venezuela, and Venezuela exports oil to the United States. b. The United States exports airplanes to China, and China exports clothing to the United States. c. The United States exports wheat to Colombia, and Colombia exports coffee to the United States.

Example 3

The U.S. Census Bureau keeps statistics on U.S. imports and exports on its website. The following steps will take you to the foreign trade statistics. Use them to answer the questions below. i. Go to the U.S. Census Bureau's website at www.census.gov ii. Under the heading "Topics" select "Business" and then select "International Trade" under the section "Data by Sector" in the left menu bar iii. At the top of the page, select the tab "Data" iv. In the left menu bar, select "Country/Product Trade" v. Under the heading "North American Industry Classification System (NAICS)-Based," select "NAICS web application" vi. In the drop-down menu "3-digit and 6-digit NAICS by country," select the product category you are interested in, and hit "Go" vii. In the drop-down menu "Select 6-digit NAICS," select the good or service you are interested in, and hit "Go" viii. In the drop-down menus that allow you to select a month and year, select "December" and "2013," and hit "Go" ix. The right side of the table now shows the import and export statistics for the entire year 2013 For the questions below on U.S. imports, use the column for "Consumption Imports, Customs Value Basis." a. Look up data for U.S. imports of hats and caps: in step (vi), select "(315) Apparel \& Accessories" and in step (vii), select "(315220) Men's and Boys' Cut and Sew Apparel." From which country do we import the most apparel? Which of the three sources of comparative advantage (climate, factor endowments, and technology accounts for that country's comparative advantage in apparel production? b. Look up data for U.S. imports of grapes: in step (vi), select "(111) Agricultural Products" and in step (vii), select "(111332) Grapes." From which country do we import the most grapes? Which of the three sources of comparative advantage (climate, factor endowments, and technology) accounts for that country's comparative advantage in grape production? c. Look up data for U.S. imports of food product machinery: in step (vi), select "(333) Machinery, Except Electrical" and in step (vii), select "333241 Food Product Machinery." From which country do we import the most food product machinery? Which of the three sources of comparative advantage (climate, factor endowments, and technology accounts for that country's comparative advantage in food product machinery?

Example 4

since 2000 , the value of U.S. imports of men's and boy's apparel from China has more than tripled. What prediction does the Heckscher-Ohlin model make about the wages received by labor in China?

Example 5

Shoes are labor-intensive and satellites are capitalintensive to produce. The United States has abundant capital. China has abundant labor. According to the Heckscher-Ohlin model, which good will China export? Which good will the United States export? In the United States, what will happen to the price of labor (the wage) and to the price of capital?
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Step-by-Step Explanations

QUESTION

How does specializing based on comparative advantage benefit a country?

STEP-BY-STEP ANSWER:

Step 1: Identify the opportunity costs for producing various goods in a country.
Step 2: Compare these opportunity costs with those of other countries to determine where each has a lower cost.
Step 3: Specialize production in goods for which the country exhibits a lower opportunity cost.
Step 4: Engage in trade with other nations that have different specializations, allowing all parties to enjoy a greater variety and quantity of goods.
Final Answer: Specializing according to comparative advantage allows a country to maximize production efficiency and benefit from increased overall output through exchange.

Comparative Advantage

QUESTION

What are the economic effects of tariffs and import quotas in protecting domestic industries?

STEP-BY-STEP ANSWER:

Step 1: Understand that tariffs are taxes imposed on imported goods, while quotas limit the quantity of goods that can be imported.
Step 2: Recognize that these measures protect domestic industries from foreign competition by making imported goods more expensive or less available.
Step 3: Acknowledge that while such policies can benefit specific domestic sectors, they often lead to inefficiencies.
Step 4: Analyze the resulting deadweight loss, which represents the loss of economic efficiency and overall welfare that is not offset by a corresponding gain.
Final Answer: Trade policies like tariffs and quotas protect certain industries at the expense of broader economic efficiency, resulting in overall welfare losses despite short-term benefits to specific groups.

Trade Policies (Tariffs and Quotas)

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Common Mistakes

  • Confusing absolute advantage with comparative advantage.
  • Assuming that all sectors benefit equally from trade without considering redistributional effects.
  • Overlooking the inefficiencies and deadweight losses caused by protectionist trade policies.
  • Believing that trade policies are solely about economic benefits without acknowledging their political motivations.