国际贸易学课件：ch7 External Economies of Scale and the International Location of Production

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1、Copyright 2012 Pearson Addison-Wesley.All rights reserved.Chapter 7External Economies of Scale and the International Location of ProductionCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-2Preview Types of economies of scale Economies of scale and market structure The theory of external e

2、conomies External economies and international trade Dynamic increasing returns International trade and economic geographyCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-3Introduction The models of comparative advantage thus far assumed constant returns to scale:When inputs to an industry

3、 increase at a certain rate,output increases at the same rate.If inputs were doubled,output would double as well.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-4Introduction(cont.)But there may be increasing returns to scale or economies of scale:This means that when inputs to an indust

4、ry increase at a certain rate,output increases at a faster rate.A larger scale is more efficient:the cost per unit of output falls as a firm or industry increases output.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-5Introduction(cont.)For example,suppose an industry produces widgets u

5、sing only one input,labor.Consider how the amount of labor required depends on the number of widgets produced.The presence of economies of scale may be seen from the fact that doubling the input of labor more than doubles the industrys output.the average amount of labor used to produce each widget i

6、s less when the industry produces more.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-6Table 7-1:Relationship of Input to Output for a Hypothetical IndustryCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-7Introduction(cont.)Mutually beneficial trade can arise as a result of

7、economies of scale.International trade permits each country to produce a limited range of goods without sacrificing variety in consumption.With trade,a country can take advantage of economies of scale to produce more efficiently than if it tried to produce everything for itself.Copyright 2012 Pearso

8、n Addison-Wesley.All rights reserved.7-8Economies of Scale and Market Structure Economies of scale could mean either that larger firms or a larger industry would be more efficient.External economies of scale occur when cost per unit of output depends on the size of the industry.Internal economies of

9、 scale occur when the cost per unit of output depends on the size of a firm.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-9Economies of Scale and Market Structure(cont.)Both external and internal economies of scale are important causes of international trade.They have different implica

10、tions for the structure of industries:An industry where economies of scale are purely external will typically consist of many small firms and be perfectly competitive.Internal economies of scale result when large firms have a cost advantage over small firms,causing the industry to become imperfectly

11、 competitive.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-10The Theory of External Economies This chapter deals with a model of external economies;the next chapter will cover internal economies.Many modern examples of industries that seem to be powerful external economies:In the Unite

12、d States,the semiconductor industry is concentrated in Silicon Valley,investment banking in New York,and the entertainment industry in Hollywood.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-11The Theory of External Economies(cont.)In developing countries such as China,external economi

13、es are pervasive in manufacturing.One town in China produces most of the worlds underwear,another nearly all cigarette lighters.External economies played a key role in Indias emergence as a major exporter of information services.Indian information services companies are still clustered in Bangalore.

14、Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-12The Theory of External Economies(cont.)For a variety of reasons,concentrating production of an industry in one or a few locations can reduce the industrys costs,even if the individual firms in the industry remain small.External economies

15、may exist for a few reasons:Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-13The Theory of External Economies(cont.)1.Specialized equipment or services may be needed for the industry,but are only supplied by other firms if the industry is large and concentrated.For example,Silicon Valle

16、y in California has a large concentration of silicon chip companies,which are serviced by companies that make special machines for manufacturing silicon chips.These machines are cheaper and more easily available there than elsewhere.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-14The T

17、heory of External Economies(cont.)2.Labor pooling:a large and concentrated industry may attract a pool of workers,reducing employee search and hiring costs for each firm.3.Knowledge spillovers:workers from different firms may more easily share ideas that benefit each firm when a large and concentrat

18、ed industry exists.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-15The Theory of External Economies(cont.)Represent external economies simply by assuming that the larger the industry,the lower the industrys costs.There is a forward-falling supply curve:the larger the industrys output,t

19、he lower the price at which firms are willing to sell.Without international trade,the unusual slope of the supply curve doesnt matter much.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-16External Economies and International Trade Prior to international trade,equilibrium prices and outp

20、ut for each country would be at the point where the domestic supply curve intersects the domestic demand curve.Suppose Chinese button prices in the absence of trade would be lower than U.S.button prices.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-17Fig.7-2:External Economies Before T

21、radeCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-18External Economies and International Trade(cont.)What will happen when the countries open up the potential for trade in buttons?The Chinese button industry will expand,while the U.S.button industry will contract.This process feeds on

22、itself:As the Chinese industrys output rises,its costs will fall further;as the U.S.industrys output falls,its costs will rise.In the end,all button production will be in China.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-19External Economies and International Trade(cont.)How does thi

23、s concentration of production affect prices?Chinese button prices were lower than U.S.button prices before trade.Because Chinas supply curve is forward-falling,increased production as a result of trade leads to a button price that is lower than the price before trade.Trade leads to prices that are l

24、ower than the prices in either country before trade!Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-20External Economies and International Trade(cont.)Very different from the implications of models without increasing returns.In the standard trade model relative prices converge as a resul

25、t of trade.If cloth is relatively cheap in the home country and relatively expensive in the foreign country before trade opens,the effect of trade was to raise cloth prices in Home and reduce them in Foreign.With external economies,by contrast,the effect of trade is to reduce prices everywhere.Copyr

26、ight 2012 Pearson Addison-Wesley.All rights reserved.7-21Fig.7-3:Trade and PricesCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-22External Economies and International Trade(cont.)What might cause one country to have an initial advantage from having a lower price?One possibility is compa

27、rative advantage due to underlying differences in technology and resources.If external economies exist,however,the pattern of trade could be due to historical accidents:Countries that start as large producers in certain industries tend to remain large producers even if another country could potentia

28、lly produce more cheaply.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-23External Economies and International Trade(cont.)A tufted blanket,crafted as a wedding gift by a 19th-century teenager,gave rise to the cluster of carpet manufacturers around Dalton,Georgia.Silicon Valley may owe

29、its existence to two Stanford graduates named Hewlett and Packard who started a business in a garage there.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-24External Economies and International Trade(cont.)Assume that the Vietnamese cost curve lies below the Chinese curve because Vietnam

30、ese wages are lower than Chinese wages.At any given level of production,Vietnam could manufacture buttons more cheaply than China.One might hope that this would always imply that Vietnam will in fact supply the world market.But this need not always be the case if China has enough of a head start.No

31、guarantee that the right country will produce a good that is subject to external economies.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-25Fig.7-4:The Importance of Established AdvantageCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-26External Economies and International T

32、rade(cont.)Trade based on external economies has an ambiguous effect on national welfare.There will be gains to the world economy by concentrating production of industries with external economies.Its possible that a country is worse off with trade than it would have been without trade:a country may

33、be better off if it produces everything for its domestic market rather than pay for imports.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-27External Economies and International Trade(cont.)Imagine that Thailand could make watches more cheaply,but Switzerland got there first.The price o

34、f watches could be lower in Thailand with no trade.Trade could make Thailand worse off,creating an incentive to protect its potential watch industry from foreign competition.What if Thailand reverts to autarky?Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-28External Economies and Inter

35、national Trade(cont.)Note that its still to the benefit of the world economy to take advantage of the gains from concentrating industries.Each country wanting to reap the benefits of housing an industry with economies of scale creates trade conflicts.Overall,its better for the world that each indust

36、ry with external economies be concentrated somewhere.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-29Fig.7-5:External Economies and Losses from TradeCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-30Dynamic Increasing Returns So far,we have considered cases where external e

37、conomies depend on the amount of current output at a point in time.But external economies may also depend on the amount of cumulative output over time.Dynamic increasing returns to scale exist if average costs fall as cumulative output over time rises.Dynamic increasing returns to scale imply dynami

38、c external economies of scale.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-31Dynamic Increasing Returns(cont.)Dynamic increasing returns to scale could arise if the cost of production depends on the accumulation of knowledge and experience,which depend on the production process over t

39、ime.A graphical representation of dynamic increasing returns to scale is called a learning curve.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-32Fig.7-6:The Learning CurveCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-33Dynamic Increasing Returns(cont.)Like external econom

40、ies of scale at a point in time,dynamic increasing returns to scale can lock in an initial advantage or a head start in an industry.Can also be used to justify protectionism.Temporary protection of industries enables them to gain experience:infant industry argument.But temporary is often for a long

41、time,and it is hard to identify when external economies of scale really exist.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-34International Trade and Economic Geography External economies may also be important for interregional trade within a country.Many movie producers located in Los

42、 Angeles produce movies for consumers throughout the U.S.Many financial firms located in New York provide financial services for consumers throughout the U.S.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-35International Trade and Economic Geography(cont.)Some nontradable goods like vet

43、erinary services must usually be supplied locally.If external economies exist,the pattern of trade may be due to historical accidents:Regions that start as large producers in certain industries tend to remain large producers even if another region could potentially produce more cheaply.Copyright 201

44、2 Pearson Addison-Wesley.All rights reserved.7-36Table 7-2:Some Examples of Tradable and Nontradable IndustriesCopyright 2012 Pearson Addison-Wesley.All rights reserved.7-37International Trade and Economic Geography(cont.)More broadly,economic geography refers to the study of international trade,int

45、erregional trade and the organization of economic activity in metropolitan and rural areas.Economic geography studies how humans transact with each other across space.Communication changes such as the Internet,e-mail,text mail,video conferencing,mobile phones(as well as modern transportation)are cha

46、nging how humans transact with each other across space.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-38Summary1.Trade need not be the result of comparative advantage.Instead,it can result from increasing returns or economies of scale,that is,from a tendency of unit costs to be lower wi

47、th larger output.2.Economies of scale give countries an incentive to specialize and trade even in the absence of differences in resources or technology between countries.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-39Summary(cont.)3.Economies of scale can be internal(depending on the

48、size of the firm)or external(depending on the size of the industry).4.Economies of scale can lead to a breakdown of perfect competition,unless they take the form of external economies,which occur at the level of the industry instead of the firm.Copyright 2012 Pearson Addison-Wesley.All rights reserv

49、ed.7-40Summary(cont.)5.External economies give an important role to history and accident in determining the pattern of international trade.When external economies are important,a country starting with a large advantage may retain that advantage even if another country could potentially produce the s

50、ame goods more cheaply.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-41Summary(cont.)6.When external economies are important,countries can conceivably lose from trade.Also the free trade price can fall below the price before trade in both countries.7.Economic geography refers to how hu

51、mans transact with each other across space,including through international trade and interregional trade.Copyright 2012 Pearson Addison-Wesley.All rights reserved.7-42Summary(cont.)8.Trade based on external economies of scale may increase or decrease national welfare,and countries may benefit from temporary protectionism if their industries exhibit external economies of scale either at a point in time or over time.