2. Chapter 3 Chapter 4 Ricardian Model Factor Inputs Income Distribution

3. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-2 Chapter 3: Preview of today’s material Ricardian model Gains from trade Wages and trade Misconceptions about comparative advantage Transportation costs and non-traded goods Empirical evidence on comparative advantage

4. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-3 Chapter 4: Preview of today’s material Introduction to Heckscher-Ohlin Model Production possibilities frontier Relationship between goods prices, factor prices, factor levels and output levels

5. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-4 Chapter 4: Next lecture Trade in the Heckscher-Ohlin model Stolper-Samuelson Theorem Rybczynski Theorem Factor price equalization Income distribution and inequality Empirical evidence on H-O model

6. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-5 Organizational stuff First presentation this Wednesday Problem set 1 due Thursday at 6pm Esteban’s office hours Thu 1-3 Sever 105 My office hours Tue 2-4 in Adams A17

7. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-6 Presentations: instructions 1-2 students for a presentation 15-20 minutes

8. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-7 Topics Week 2 (7/4): Globalization and Inequality Week 3 (7/11): Rise of Outsourcing Week 4 (7/16): Emerging World Multinationals Week 5 (7/25): Costs of Protectionism Week 6 (8/1): China and India Readings uploaded on the course website (left tab: Links to Readings)

9. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-8 Setting stage for gains from trade calculus Key conclusion of Ricardo’s model: even if a country is the least (most) efficient producer of all goods, it still can benefit from trade. To see how all countries can benefit from trade, we calculate relative prices when trade exists (relative price ratios will change!) Remember: without trade, relative price of a good equals opportunity cost of producing it

10. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-9 Key trigger for gains from trade: relative price ratios change after trade The opening of profitable international trade will start arbitrage (buy low-sell high trades) and push the two separate national price ratios toward a world price The world price will depend on how strongly the 2 countries demand each of the 2 goods PPF of each of the countries will expand (due to specialization & trade, explained later)

11. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-10 Gains From Trade: Home Specializes in Cheese, Benefits From its Rising Price Gains from trade come from specializing in production that use resources most efficiently, and using the income generated from that production to buy the goods and services that countries desire.  where “using resources most efficiently” means producing a good in which a country has a comparative advantage. Domestic workers earn a higher income from cheese production because the relative price of cheese increases with trade.

12. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-11 Foreign Specializes in Wine, Reaps From Exports, Gets Cheaper Cheese Imports Foreign workers earn a higher income from wine production because the relative price of cheese in their country decreases with trade (making cheese cheaper) and the relative price of wine increases with trade (making exports proceeds larger).

13. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-12 Preview of Relative Supply and Demand Graph that will show it RD 1 a LC /a LW a * LC /a * LW RS Relative price of cheese, P C /P W Relative quantity of cheese, Q C + Q * C Q W + Q * W L/a LC L * /a * LW

14. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-13 Opportunity costs a LC /a LW... Opportunity cost of producing cheese in Home country a * LC /a * LW … Opportunity cost of producing cheese in Foreign

15. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-14 Specialization in cheese If P C /a LC > P W /a LW workers will make only cheese. Wages in cheese sector higher than in wine sector Rewrite the equation: P C /P W > a LC /a LW The economy will specialize in cheese production if the price of cheese relative to the price of wine exceeds the opportunity cost of producing cheese. Relative cheese/wine price ratio > opportunity cost of producing cheese

16. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-15 Specialization in wine If P C /a LC < P W /a LW workers will make only wine. If P C /P W < a LC /a LW workers will only make wine. If P W /P C > a LW /a LC workers will only make wine. The economy will specialize in wine production if the price of wine relative to the price of cheese exceeds the opportunity cost of producing wine. Relative wine/cheese price ratio > opportunity cost of producing wine

17. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-16 Start with relative quantities of output To calculate relative prices with trade, we first calculate relative quantities of world production: (Q C + Q * C )/(Q W + Q * W )

18. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-17 Relative Supply of Cheese as a function of Relative Price of Cheese Next we consider relative supply of cheese: the quantity of cheese supplied by all countries relative to the quantity of wine supplied by all countries This relative supply will differ for each relative price of cheese, P c /P W, so we can graph it

19. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-18 Relative Supply Graphically a LC /a LW a * LC /a * LW RS Relative price of cheese, P C /P W Relative quantity of cheese, Q C + Q * C Q W + Q * W L/a LC L * /a * LW

20. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-19 P C /P W < a LC /a LW Relative Price of Cheese Too Low There is no supply of cheese if the relative price of cheese falls below a LC /a LW. Why? because the domestic country will specialize in wine production whenever P C /P W < a LC /a LW (Recall that Home specializes in wine when P C / a LC wages of cheese makers) And we assumed that a LC /a LW < a * LC /a * LW so foreign workers won’t find it desirable to produce cheese either.

21. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-20 P C /P W = a LC /a LW When P C /P W = a LC /a LW, domestic workers will be indifferent between producing wine or cheese, but foreign workers will still produce only wine.

22. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-21 a * LC /a * LW > P c /P W > a LC /a LW When a * LC /a * LW > P c /P W > a LC /a LW, domestic workers specialize in cheese production because they can earn higher wages in the sector, but foreign workers will still produce only wine.

23. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-22 a * LC /a * LW = P C / P W When a * LC /a * LW = P C / P W, foreign workers will be indifferent between producing wine or cheese, but domestic workers will still produce only cheese.

24. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-23 a * LC /a * LW < P C / P W Relative price of wine too low There is no supply of wine if the relative price of cheese rises above a * LC /a * LW

25. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-24 Relative Demand: Falls as Relative Price Grows Relative demand of cheese is the quantity of cheese demanded in all countries relative to the quantity of wine demanded in all countries at each relative price of cheese, P C /P W. As the relative price of cheese rises, consumers in all countries will tend to purchase less cheese and more wine so that the relative quantity of cheese demanded falls.

26. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-25 RD for cheese is a decreasing function of relative price of cheese RD 1 a LC /a LW a * LC /a * LW RS Relative price of cheese, P C /P W Relative quantity of cheese, Q C + Q * C Q W + Q * W L/a LC L * /a * LW

27. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-26 RD’ shows a case when Home does not specialize completely

28. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-27 Gains From Trade: Domestic Workers Gains from trade come from specializing in production that use resources most efficiently, and using the income generated from that production to buy the goods and services that countries desire.  where “using resources most efficiently” means producing a good in which a country has a comparative advantage. Domestic workers earn a higher income from cheese production because the relative price of cheese increases with trade.

29. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-28 Gains From Trade: Foreign Workers Foreign workers earn a higher income from wine production because the relative price of cheese decreases with trade (making cheese cheaper) and the relative price of wine increases with trade (foreign workers will focus on wine production in our model).

30. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-29 Consumption in each country expands because output expands due to specialization We show how consumption possibilities expand beyond the production possibility frontier when trade is allowed. Without trade, consumption is restricted to what is produced. With trade, consumption in each country is expanded because world production is expanded when each country specializes in producing the good in which it has a comparative advantage.

31. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-30 Trade & Specialization Expand PPF

32. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-31 Trade as a “technology” that converts one product into another efficiently We can also think of trade as an indirect method of production or a new technology that converts cheese into wine or vice versa. Without the technology, a country has to allocate resources to produce all of the goods that it wants to consume. With the technology, a country can specialize its production and trade (“convert”) the products for the goods that it wants to consume.

33. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-32 Gains from trade: numerical example

34. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-33 First determine relative price of cheese Must lie between opportunity cost of cheese in the two countries In Home, opportunity cost of cheese in terms of wine is ½ In Foreign, opportunity cost of cheese is 2 In world equilibrium, the relative price of cheese is btw ½ and 2: we assume it’s 1

35. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-34 Gains from trade: Home In direct production, an hour of Home labor produces only ½ gallon of wine The same hour could be used to produce 1 pound of cheese, which can then be traded for 1 gallon of wine Clearly, Home gains from trade

36. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-35 Gains from trade: Foreign Foreign could use 1 hour of labor to produce 1/6 pound of cheese If it uses the hour to produce 1/3 gallon of wine, it can trade 1/3 gallon of wine for 1/3 pound of cheese This is twice as much as the 1/6 pound of cheese its gets using the hour to produce the cheese directly

37. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-36 Relative Wages: no convergence Relative wages are the wages of the domestic country relative to the wages in the foreign country. Although the Ricardian model predicts that relative prices equalize across countries after trade, it does not predict that relative wages will do the same. Remember: hourly wages were defined as price of good / unit labor requirement

38. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-37 Hourly Wages: P c /a LC, P W /a LW  hourly wages of cheese makers are equal to the market value of the cheese produced in an hour: P c /a LC  hourly wages of wine makers are equal to the market value of the wine produced in an hour: P W /a LW

39. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-38 Productivity differences determine wages Productivity (technological) differences determine wage differences in the Ricardian model. A country with absolute advantage (lower unit labor requirement) in producing a good will enjoy a higher wage in that industry after trade.

40. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-39 Relative Wages: Numerical Example Suppose that P C = $12/kg and P W = $12/L Unit labor requirement same as in previous example Since domestic workers specialize in cheese production after trade, their hourly wages will be (1/a LC )P C = (1/1)$12 = $12 Since foreign workers specialize in wine production after trade, their hourly wages will be (1/a * LW )P W = (1/3)$12 = $4 The relative wage of domestic workers is therefore $12/$4 = 3

41. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-40 Wages-productivity considerations These relationships imply that both countries have a cost advantage in production.  The cost of high wages can be offset by high productivity.  The cost of low productivity can be offset by low wages.

42. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-41 Low Wages or High Productivity Because foreign workers have a wage that is only 1/3 the wage of domestic workers, they are able to attain a cost advantage (in wine production), despite low productivity. Because domestic workers have a productivity that is 6 times that of foreign workers (in cheese production), they are able to attain a cost advantage, despite high wages.

43. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-42 Do Wages Reflect Productivity? In the Ricardian model, relative wages reflect relative productivities of the two countries. Is this an accurate assumption? Some argue that low wage countries pay low wages despite growing productivity, putting high wage countries at a cost disadvantage. But evidence shows that low wages are associated with low productivity.

44. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-43 Wage Rate Proportional to Productivity

45. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-44 South Korea Example Shows That Wages Rise As Productivity Rises Other evidence shows that wages rise as productivity rises.  In 2000, South Korea’s labor productivity was 35% of the US level and its average wages were about 38% of US average wages.  After the Korean War, South Korea was one of the poorest countries in the world, and its labor productivity was very low.  In 1975, average wages in South Korea were still only 5% of US average wages.

46. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-45 Misconceptions About Comparative Advantage 1.Productivity and Competitiveness 2.The Pauper Labor Argument 3.Exploitation

47. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-46 Productivity and Competitiveness 1.Free trade is beneficial only if a country is more productive than foreign countries.  But even an unproductive country benefits from free trade by avoiding the high costs for goods that it would otherwise have to produce domestically.  High costs derive from inefficient use of resources.  The benefits of free trade do not depend on absolute advantage, rather they depend on comparative advantage: specializing in industries that use resources most efficiently.

48. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-47 Pauper Labor Argument 2.Free trade with countries that pay low wages hurts high wage countries.  While trade may reduce wages for some workers, thereby affecting the distribution of income within a country, trade benefits consumers and other workers.  Consumers benefit because they can purchase goods more cheaply (more wine in exchange for cheese).  Producers/workers benefit by earning a higher income (by using resources more efficiently and through higher prices/wages).

49. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-48 Using our wine/cheese example In our example, it doesn’t matter whether the lower cost of wine produced in Foreign is due to high productivity or low wages All that matters to Home is that it is cheaper in terms of its own labor for Home to produce cheese and trade it for wine than to produce wine for itself

50. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-49 Exploitation 3.Free trade exploits less productive countries.  While labor standards in some countries are less than exemplary compared to Western standards, they are so with or without trade.  Are high wages and safe labor practices alternatives to trade? Deeper poverty and exploitation (e.g., involuntary prostitution) may result without export production.  Consumers benefit from free trade by having access to cheaply (efficiently) produced goods.  Producers/workers benefit from having higher profits/wages—higher compared to the alternative.

51. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-50 Comparative Advantage With Many Goods Suppose now there are N goods produced, indexed by i = 1,2,…N. The domestic country’s unit labor requirement for good i is a Li, and that of the foreign country is a * Li

52. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-51 Introducing wages (w): Good 1 produced at Home if wa L1 < w * a * L1 Goods will be produced wherever it is cheaper to produce them. Let w represent the wage rate in the domestic country and w * represent the wage rate in the foreign country.  If wa L1 < w * a * L1 then only domestic country will produce good 1, since total wage payments are less there.

53. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-52 Good produced if relative productivity > relative wage (a * L1 /a L1 > w/w * )  If the relative productivity of a country in producing a good is higher than the relative wage, then the good will be produced in that country (Home in our case).

54. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-53 5 goods: Productivity Comparison

55. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-54 Home: apples, bananas, caviar If w/w * = 3, the domestic country will produce apples, bananas, and caviar, while the foreign country will produce dates and enchiladas.  The relative productivities of the domestic country in producing apples, bananas and caviar are higher than the relative wage.

56. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-55 Each country specializes in goods where it has relatively higher productivity If each country specializes in goods that use resources productively and trades the products for those that it wants to consume, then each benefits.  If a country tries to produce all goods for itself, resources are “wasted”. The domestic country has high productivity in apples, bananas, and caviar that give it a cost advantage, despite its high wage. The foreign country has low wages that give it a cost advantage, despite its low productivity in dates.

57. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-56 How is the relative wage related to relative supply/demand for labor The relative (derived) demand for domestic labor services falls when w/w * rises. As domestic labor becomes more expensive relative to foreign labor,  goods produced in the domestic country become more expensive, and demand for these goods and the labor to produce them falls.  fewer goods will be produced in the domestic country, further reducing the demand for domestic labor.

58. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-57 Comparative Advantage With Many Goods (cont.)

59. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-58 Comparative Advantage With Many Goods (cont.) Suppose w/w * increases from 3 to 3.99:  The domestic country would produce apples, bananas, and caviar, but the demand for these goods and the labor to produce them falls as the relative wage rises. Suppose w/w * increases from 3.99 to 4.01:  Caviar is now too expensive to produce in the domestic country, so the caviar industry moves to the foreign country, causing a discrete (abrupt) drop in the demand for domestic labor (the horizontal “step” in the demand function).

60. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-59 Comparative Advantage With Many Goods (cont.)

61. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-60 Relative supply of labor Finally, suppose that relative supply of labor is independent of w/w * and is fixed at an amount determined by the populations in the domestic and foreign countries.

62. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-61 Comparative Advantage With Many Goods (cont.)

63. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-62 Why Complete Specialization is Rare The Ricardian model predicts that countries should completely specialize in production. But this rarely happens for primarily 3 reasons: 1. More than one factor of production reduces the tendency of specialization (chapter 4) 2. Protectionism (chapters 8–11) 3. Transportation costs reduce or prevent trade, which may cause each country to produce the same good or service

64. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-63 Transportation Costs and Non-traded Goods Non-traded goods and services (e.g., haircuts and auto repairs) exist due to high transportation costs.  Countries tend to spend a large fraction of national income on non-traded goods and services.  This fact has implications for the gravity model and for models that consider how income transfers across countries affect trade.

65. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-64 Empirical Evidence on Ricardo’s Model: US and UK Productivity and Exports in ‘51 Do countries export those goods in which their productivity is relatively high? The ratio of US to British exports in 1951 compared to the ratio of US to British labor productivity in 26 manufacturing industries suggests yes. At this time the US had an absolute advantage in all 26 industries, yet the ratio of exports was low in the least productive sectors of the US.

66. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-65 High Productivity Leads to Higher Exports

67. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-66 Summary 1.A country has a comparative advantage in producing a good if the opportunity cost of producing that good is lower in the country than it is in other countries.  A country with a comparative advantage in producing a good uses its resources most efficiently when it produces that good compared to producing other goods. 2.The Ricardian model focuses only on differences in the productivity of labor across countries, and it explains gains from trade using the concept of comparative advantage.

68. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-67 Summary (cont.) 3.When a country specializes and trades according to the Ricardian model; the relative price of the produced good rises, income for workers rises and imported goods are less expensive for consumers. 4.Trade is predicted to benefit both high productivity and low productivity countries, although trade may change the distribution of income within countries.

69. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-68 Summary (cont.) 5.High productivity or low wages give countries a cost advantage that allow them to produce efficiently. 6.Although empirical evidence supports trade based on comparative advantage, transportation costs and other factors prevent complete specialization in production.

70. Chapter 4 Resources, Comparative Advantage and Income Distribution

71. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-70 Preview: this lecture Intro to Heckscher-Ohlin Model Production possibilities frontier Relationship between goods prices, factor prices and factor levels Relationship between goods prices, factor prices, factor levels and output levels.

72. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-71 Next lecture Trade in the Heckscher-Ohlin model Rybczynski Theorem Stolper-Samuelson Theorem Factor price equalization Income distribution and income inequality Empirical evidence

73. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-72 Some definitions to introduce Heckscher-Ohlin Theory Factors of production Factor abundance (countries) Factor intensity (products)

74. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-73 Factors of production Land (including forests, natural resources) Labor (high-skilled, low-skilled) Capital (physical, human) Technology (including intangibles such as know-how, market economy etc.)

75. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-74 Factor abundance Labor: A country is relatively labor- abundant if it has a higher ratio of labor to other factors than does the rest of the world Example: Bangladesh

76. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-75 Factor intensity Labor: A product is relatively labor- intensive if labor costs are a greater share of its value than they are of the value of other products Example: textiles

77. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-76 Heckscher-Ohlin Theory of Trade A country will export products that use relatively intensively those production factors found relatively abundantly in the country It will import products that use relatively intensively those production factors that are relatively scarce in the country.

78. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-77 H-O Predictions Assume wheat is land-intensive and cloth is labor-intensive and there is more land per laborer in the US than in the rest of the world The H-O theory predicts that the US exports wheat and imports cloth

79. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-78 Population densities & wheat trade in 1860: High Density-Imports, Low Density-Exports Person per sq mile (1860) % of world wheat exports US924.9 Canada96.4 Russia3112.0 India1173.2 France183zero balance Britain240imports

80. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-79 Two Factor Heckscher-Ohlin Model 1.Labor and land are resources important for production. 2.The amount of labor and land varies across countries, and this variation influences productivity. 3.The supply of labor and land in each country is constant. 4.Only two goods are important for production and consumption: cloth and food. 5.Competition allows factors of production to be paid a “competitive” wage, a function of their productivities and the price of the good that it produces, and allows factors to be used in the industry that pays the highest wage/rate. 6.Only two countries are modeled: domestic and foreign

81. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-80 Production Possibilities: 2 Factors When there is more than one factor of production, the PPF (opportunity cost in production) is no longer a straight line. Why? Let’s expand the previous chapter’s model to include two factors of production, labor and land.  a TC = hectares of land used to produce one m 2 of cloth  a LC = hours of labor used to produce one m 2 of cloth  a TF = hectares of land used to produce one calorie of food  a LF = hours of labor used to produce one calorie of food  L = total amount of labor available for production  T = total amount of land (terrain) available for production

82. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-81 2 resource constraints: land and labor Production possibilities are influenced by both land and labor (requirements): a TF Q F + a TC Q C ≤ T a LF Q F + a LC Q C ≤ L Total amount of land resources Land required for each unit of food production Total units of food production Land required for each unit of cloth production Total units of cloth production Total amount of labor resources Labor required for each unit of food production Labor required for each unit of cloth production

83. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-82 Cloth-labor intensive Food-land intensive Let’s assume that each unit of cloth production uses labor intensively and each unit of food production uses land intensively:  a LC /a TC > a LF /a TF  Or a LC /a LF > a TC /a TF  Or, we consider the total resources used in each industry and say that cloth production is labor intensive and food production is land intensive if L C /T C > L F /T F. This assumption influences the slope of the production possibility frontier:

84. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-83 Opportunity cost of cloth in terms of food rises as more cloth is produced

85. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-84 Opportunity cost not constant The opportunity cost of producing cloth in terms of food is not constant in this model:  it’s low when the economy produces a low amount of cloth and a high amount of food  it’s high when the economy produces a high amount of cloth and a low amount of food

86. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-85 We can now allow for substitution of labor for land in production The above PPF equations do not allow substitution of land for labor in production or vice versa.  Unit factor requirements are constant along each line segment of the PPF. If we allow substitution of inputs, then the PPF becomes curved.  For example, many laborers could work on a small plot of land or a few labors could work on a large plot of land to produce the same amount of output.  Unit factor requirements are not constant at every quantity of cloth and food produced.

87. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-86 Now PPF Will Be Curved: Opportunity Costs Will Be Changing Continually

88. Copyright © 2006 Pearson Addison-Wesley. All rights reserved. 3-87 Recommended readings Benefits and Costs of Following Comparative Advantage by Deardoff Irwin ch. 2: The Case for Free Trade: Old Theories, New Evidence