International Economics Twelfth Edition

International Economics Twelfth Edition
CHAPTER T H R E E 3 International Economics Twelfth Edition The Standard Theory Of International Trade RICORDO di portare il libro a lezione. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Learning Goals: Understand how relative commodity prices and the comparative advantage of nations are determined under increasing costs. Show the basis and the gains from trade under increasing costs. Explain the relationship between international trade and deindustrialization in the U.S. and other advanced nations. Bibliografia: Sei lezioni (cap. 2), dispense cap. 3, Salvatore cap. 3. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Extending the simple trade model
3.1 Introduction Extending the simple trade model Increasing opportunity costs Tastes and preferences Incomplete specialization Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.2 The Production Frontier with Increasing Costs
Increasing Opportunity Costs A nation must give up more and more of one commodity to release just enough resources to produce each additional unit of another commodity. Increasing cost production possibilities frontier is concave to the origin. The marginal rate of transformation (MRT) increases as more units of good X are produced. The marginal rate of transformation is another name for opportunity cost. The value of MRT is given by the slope of the PPF. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Ipotesi piena occupazione e costi crescenti
Lungo le curve delle possibilità produttive c’è sempre la po per le ragioni spiegate nel cap. 2 delle 6lezioni e nel cap. 3 delle dispense I costi crescenti sono opinabili; nella realtà dominano I rendimenti di scala crescenti (dunque costi decrescenti) Un paese ha costi crescenti in una produzione se ha scarsità di un fattore peculiare a quella produzione.

FIGURE 3-1 Production Frontiers of Nation 1 and Nation 2 with Increasing Costs. A sinistra si deve dare sempre di più di Y per la medesima quantità di X (ovvero, muovendosi all’indietro medesime q. di X producono sempre meno Y). A destra sempre più di X per la medesima q. di Y. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.2 The Production Frontier with Increasing Costs
Reasons for Increasing Opportunity Cost 1 1) Factors of production are not homogeneous, and thus producing increasing amounts of a good requires using inputs that are less productive. Mmmmmm! I fattori sono in genere considerati omogenei! Il lavoro ha per esempio la medesima qualità. Dovremmo allora per esempio dire: all’aumentare della produzione del bene Z si easurisce l’offerta di un particolare lavoro specializzato il cui costo perciò aumenta; oppure si esaurisce l’offerta di un certo minerale (silicio per i chips) etc. Ma questo è il punto 2 di DS Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Reasons for Increasing Opportunity Cost 2
2) Beni a diversa intensità fattoriale (un bene Y è a > intensità di L e l’altro bene X è a > intensità di K. Quando diminuisco Y, trasferisco molto L a X per il quale però L è il fattore meno “adatto”. Reasons for Differing PPFs Different countries have different resource endowments, giving rise to different PPFs. (lo vedremo meglio dopo con HO) 3) May also use different technologies Abbiamo ora ragionato dal lato dell’offerta, introduciamo ora un’altro concetto dal lato della domanda, le curve di indifferenza collettive

3.3 Community Indifference Curves
Combinations of two commodities that yield equal satisfaction to the community or nation. Negatively sloped and convex to the origin. Cannot cross. Slope = Marginal Rate of Substitution (MRS) The MRS of X for Y in consumption is the amount of Y that a nation could give up for one extra unit of X and still remain on the same indifference curve. The marginal rate of substitution (MRS) falls as more of good X is consumed. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

FIGURE 3-2 Community Indifference Curves for Nation 1 and Nation 2.
Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.3 Community Indifference Curves
Problems The distribution of income is held constant when drawing community indifference curves, and a different income distribution could result in very different curves. Es con distrib ineguale la società scambia volentieri molti beni di sussitenza per pochi beni di lusso. Trade can change the distribution of income significantly, and thus expansion of trade may cause intersecting indifference curves and unclear effects on social welfare. VI DI USCITA: Compensation principle: the nation benefits from trade if the winners would be better off even after compensating the losers. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.4 Equilibrium in Isolation
Interaction of forces of demand (community indifference curves) and supply (production possibilities frontier) determine equilibrium for a nation in the absence of trade (autarky). Nations seek the highest possible indifference curve, given the production constraint. The equilibrium-relative commodity price in isolation = slope of tangency between PPF and indifference curve at autarky point of production and consumption. Relative prices are different in Nation 1 and Nation 2 because of different shape and location of PPF’s and indifference curves. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

NB pA = px/py Equilibrium in Isolation
NB pA = px/py Equilibrium in Isolation. In A il prezzo di X è ¼ di quello di Y; in 2 il prezzo di X è 4 volte quello di Y. Paese 1 ha un vantaggio comparato in X, e 2 in Y. v. p. 65 (a me non è chiaro da dove ha derivato questi prezzi o se li ha semplicemente supposti: mi sfugge qualcosa?) Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.5 The Basis for and Gains from Trade with Increasing Costs
Relative commodity price differentials between two nations reflect comparative advantages, and form basis for mutually beneficial trade. Each nation should specialize in the commodity they can produce at the lowest relative price. Insomma, se I paesi si aprono al mercato la domanda di X si rivolge tutta al paese 1 e di Y al paese 2. PA sale, PA’ scende Specialization will continue until relative prices equalize between nations. Specialization will usually be incomplete, since costs of production increase in each country with greater specialization (i costi di produzione convergono). Non accadeva in Ricardo Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

FIGURE 3-4 The Gains from Trade with Increasing Costs
FIGURE 3-4 The Gains from Trade with Increasing Costs. Via via che i paesi si specializzano la ragione di scambio internazionale si colloca fra ¼ e 4, nella figura è 1X = 1Y. Leggere p. 66 Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Equilibrium-relative commodity price with trade = common relative price at which trade is balanced. Balanced trade: quantity of X (Y) Nation 1(2) wants to export = quantity of X(Y) Nation 2(1) wants to import. Any other relative price could not persist because trade would be not be balanced. Esempio se px/py = 2, paese 1 vorrebbe esportare di più e il prezzo cadrebbe… v.p.66 In general, the greater the change from a nation’s autarky price to the post-trade price, the greater the size of the gains from trade. v.p.66 Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

Specializzazione incompleta
Nel modello a costi costanti (Ricardo) la specializzazione era completa, con costi crescenti è incompleta - questo perché via via che un paese si specializza in un prodotto, lo fa a costi crescenti, e il vantaggio comparato scema (tanto più che l’altro paese de-specializza in quel prodotto e lo fa a costi decrescenti: despecializzando usa meno dele risorse peculiari a quel bene che diventano dunque meno scarse e dunque meno costose).

The Gains from Exchange and Specialization A nation’s gains from trade can be broken down into two components. Gains from exchange = increase in consumption from the change in the relative price (compared to the autarky price), holding production constant (da punto A Point T in Figure 3-5) Cioè a parità di produzione ai nuovi prezzi il paese sta su una curva di indifferenza più alta Gains from specialization = increase in consumption resulting from the reallocation of production towards the good in which the country has a comparative advantage, holding the world relative price constant. (da A  B  Point E in Figure 3-5). Inoltre si specializza (il che consente che a livello globale si impieghino meglio le risorse producendo nel complesso di più), e quindi sale anche più in alto Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

FIGURE 3-5 The Gains from Exchange and from Specialization.

3.5 The Basis for and Gains from Trade with Increasing CostsNO
The switch in production of goods from autarky to the trade equilibrium also causes changes in employment of factors of production in each sector. In industrialized countries, this implies loss of manufacturing jobs– deindustrialization. But empirical evidence shows that most manufacturing job loss has been due to change in labor productivity and other internal causes rather than trade. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

3.6 Trade Based on Differences in Taste (just register this case) NO
Even if two nations have identical PPFs, basis for mutually beneficial trade will still exist if tastes, or demand preferences, differ. Nation with relatively smaller demand for X will have a lower autarky relative price for, and comparative advantage, in X. Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

FIGURE 3-6 Trade Based on Differences in Tastes.NO

Case Study 3-1 Comparative Advantage of the Largest Advanced and Emerging Economies Leggere

Case Study 3-2 Specialization and Export Concentration in Selected Countries Leggere

Case Study 3-3 Job Losses in High Import-Competing Industries Leggere

Appendix to Chapter 3 Production Functions, Isoquants, Isocosts and Equilibrium Production Theory with Two Nations, Two Commodities, and Two Factors The Edgeworth Box and Production Frontiers NO Salvatore: International Economics, 12th Edition © 2016 John Wiley & Sons, Inc.

FIGURE 3-7 Isoquants, Isocosts, and Equilibrium.

FIGURE 3-8 Production with Two Nations, Two Commodities, and Two Factors. commentare pp. 81-82

FIGURE 3-9 Derivation of the Edgeworth Box Diagram and Production Frontier for Nation 1.NO

FIGURE 3-10 Derivation of the Edgeworth Box Diagram and Production Frontier for Nation 2.NO

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