Professor Christina Romer. LECTURE 2 COMPARATIVE ADVANTAGE AND THE GAINS FROM SPECIALIZATION January 19, 2017
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1 Economics 2 Spring 2017 Professor Christina Romer Professor David Romer LECTURE 2 COMPARATIVE ADVANTAGE AND THE GAINS FROM SPECIALIZATION January 19, 2017 I. OVERVIEW II. THE KEY ROLE OF DIFFERENCES IN RELATIVE ABILITY A. Intuition B. Example: Specialization within a household C. Reciprocal absolute advantage 1. Definition of absolute advantage 2. Comparing outcomes without and with specialization D. Comparative advantage 1. Definition of comparative advantage 2. Comparing outcomes without and with specialization 3. Reciprocal absolute advantage is just a special case of comparative advantage III. OPPORTUNITY COST AND COMPARATIVE ADVANTAGE A. Comparative advantage means that a producer has a lower opportunity cost B. There are gains from specialization when opportunity cost differs C. Comparative advantage is a relative concept IV. SPECIALIZATION AND THE CURVATURE OF THE PRODUCTION POSSIBILITIES CURVE A. Example: Specialization in a two-person economy B. Individual PPCs in a two-person economy C. PPC of two people combined without specialization D. PPC of two people combined with specialization E. What do we learn from this example? F. Will both parties gain from specialization? V. REAL-WORLD EXAMPLE: SHOULD CALIFORNIA GROW RICE? A. Facts about California agriculture and water use B. Relative opportunity cost of growing rice in California and Arkansas C. Are we specializing along the lines of comparative advantage?
2 Economics 2 Spring 2017 Christina Romer David Romer LECTURE 2 Comparative Advantage and the Gains from Specialization January 19, 2017
3 Announcements It is essential that you attend section this week. Some hints on taking notes and reading the textbook. Reminder: please put away all electronic devices.
4 I. OVERVIEW
5 Two Fundamental Building Blocks Scarcity, choice, and opportunity cost. Comparative advantage and the gains from specialization.
6 II. THE KEY ROLE OF DIFFERENCES IN RELATIVE ABILITY
7 Example: Specialization within a Household Two activities: dishwashing and painting. There are 3 walls that need painting (and many dirty dishes).
8 Reciprocal Absolute Advantage Walls Dishes Abilities (per hour) C D No Specialization (Each paints ½ hr. and washes ½ hr.) C. 2 6 D Specialization (C. paints ¾ hr. and washes ¼ hr.; D. washes 1 hr.) C. 3 3 D
9 Absolute Advantage Someone or something can produce more with a given amount of resources.
10 Comparative Advantage Walls Dishes Abilities (per hour) C D No Specialization (Each paints ½ hr. and washes ½ hr.) C D Specialization (C. paints ¾ hr. and washes ¼ hr.; D. washes 1 hr.) C. 3 6 D
11 Comparative Advantage Someone or something is relatively more productive at one activity than at another.
12 Messages Comparative advantage is necessary for there to be gains from specialization. Reciprocal absolute advantage is just a special case of comparative advantage.
13 III. OPPORTUNITY COST AND COMPARATIVE ADVANTAGE
14 Opportunity Cost and Comparative Advantage Abilities (per hour) C. 4 walls or 24 dishes D. 2 walls or 20 dishes Opportunity Cost of 1 Wall C. 24/4 = 6 dishes D. 20/2 = 10 dishes Opportunity Cost of 1 Dish C. 4/24 = 1/6 wall D. 2/20 = 1/10 wall Lower opportunity cost implies comparative advantage.
15 Some Observations There are gains from specialization when opportunity cost differs. How much we want to specialize depends on how many of the two activities need to be done. Comparative advantage is inherently a relative concept.
16 IV. SPECIALIZATION AND THE CURVATURE OF THE PRODUCTION POSSIBILITIES CURVE
17 Example: Specialization in a Two-Person Economy Two goods: fish and coconuts. Abilities: In an hour, Robinson can catch 1 fish or gather 1 coconut. (So Robinson s opportunity cost of 1 coconut is 1 fish.) In an hour, Friday can catch 8 fish or gather 2 coconuts. (So Friday s opportunity cost of 1 coconut is 4 fish.) Each of them works 6 hours a day.
18 Robinson s Production Possibilities Curve Fish Slope is 1, because the opportunity cost for Robinson of gathering 1 coconut is 1 fish. 6 PPC Coconuts
19 Friday s Production Possibilities Curve Fish 48 Slope is 4, because the opportunity cost for Friday of gathering 1 coconut is 1 fish. PPC Coconuts
20 Opportunity Cost When Robinson and Friday Allocate Their Time the Same Way (No Specialization) In an hour, they could catch 9 fish (1 from Robinson and 8 from Friday). Or they could gather 3 coconuts (1 from Robinson and 2 from Friday). So, they trade off 9 fish for 3 coconuts. The opportunity cost of 1 coconut is 3 fish.
21 Combined PPC without Specialization Fish 54 Slope is 3, because the opportunity cost of gathering 1 coconut for the two combined without specialization is 3 fish. PPC Coconuts
22 Opportunity Costs with Specialization In an hour, Robinson could catch 1 fish or gather 1 coconut. So, the opportunity cost of having Robinson gather 1 coconut is 1 fish. In an hour, Friday could catch 8 fish or gather 2 coconut. So, the opportunity cost of having Friday gather 1 coconut is 4 fish. Robinson is the low opportunity cost provider of coconuts.
23 Combined PPC with Specialization Fish Slope = 1 PPC Slope = Coconuts
24 What Do We Learn from This Example? There are gains from specialization when opportunity differs across producers and production is organized according to comparative advantage. This explains why the PPC for a country is likely to be bowed out. One determinant of the size of the gains from specialization is the difference in opportunity cost.
25 Gains from Specialization Fish PPC with Specialization PPC without specialization Coconuts
26 Will Both Robinson and Friday Benefit from Specialization? Simple Answer: As long as there is no coercion, if two parties choose to specialize and trade, both must be benefitting. More complicated answer: In a market system, prices will tend to adjust to ensure that both parties gain from specialization and trade.
27 V. REAL-WORLD EXAMPLE: SHOULD CALIFORNIA GROW RICE?
28 Source, Congressional Research Service, California Agricultural Production and Irrigated Water Use, 2015.
29 Source, Congressional Research Service, California Agricultural Production and Irrigated Water Use, 2015.
30 Is California the Low-Opportunity-Cost Rice Producer in the U.S.? What does California give up to grow rice? What do other rice-compatible states (such as Arkansas) give up to grow rice?
31 Source, Congressional Research Service, California Agricultural Production and Irrigated Water Use, 2015.
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