国际经济学作业答案-第六章完整版.doc

Chapter 6 Economies of Scale, Imperfect Competition, and International TradeMultiple Choice Questions1. External economies of scale arise when the cost per unit(a) rises as the industry grows larger.(b) falls as the industry grows larger rises as the average firm grows larger.(c) falls as the average firm grows larger.(d) remains constant.(e) None of the above.Answer: B2. Internal economies of scale arise when the cost per unit(a) rises as the industry grows larger.(b) falls as the industry grows larger.(c) rises as the average firm grows larger.(d) falls as the average firm grows larger.(e) None of the above.Answer: D3. External economies of scale(a) may be associated with a perfectly competitive industry.(b) cannot be associated with a perfectly competitive industry.(c) tends to result in one huge monopoly.(d) tends to result in large profits for each firm.(e) None of the above.Answer: A4. Internal economies of scale(a) may be associated with a perfectly competitive industry.(b) cannot be associated with a perfectly competitive industry.(c) are associated only with sophisticated products such as aircraft.(d) cannot form the basis for international trade.(e) None of the above.Answer: BChapter 6 Economies of Scale, Imperfect Competition, and International Trade 715. A monopolistic firm(a) can sell as much as it wants for any price it determines in the market.(b) cannot determine the price, which is determined by consumer demand.(c) will never sell a product whose demand is inelastic at the quantity sold.(d) cannot sell additional quantity unless it raises the price on each unit.(e) None of the above.Answer: C6. Monopolistic competition is associated with(a) cut-throat price competition.(b) product differentiation.(c) explicit consideration at firm level of the feedback effects of other firms’ pr icing decisions.(d) high profit margins.(e) None of the above.Answer: B7. The most common market structure is(a) perfect competition.(b) monopolistic competition.(c) small-group oligopoly.(d) perfectly vertical integration.(e) None of the above.Answer: C8. Modeling trade in monopolistic industries is problematic because(a) there is no one generally accepted model of oligopoly behavior.(b) there are no models of oligopoly behavior.(c) it is difficult to find an oligopoly in the real world.(d) collusion among oligopolists makes usable data rare.(e) None of the above.Answer: A9. Where there are economies of scale, the scale of production possible in a country is constrained by(a) the size of the country.(b) the size of the trading partner’s country.(c) the size of the domestic market.(d) the size of the domestic plus the foreign market.(e) None of the above.Answer: D10. Where there are economies of scale, an increase in the size of the market will(a) increase the number of firms and raise the price per unit.(b) decrease the number of firms and raise the price per unit.(c) increase the number of firms and lower the price per unit.(d) decrease the number of firms and lower the price per unit.(e) None of the above.Answer: C11. The simultaneous export and import of widgets by the United States is an example of(a) increasing returns to scale.(b) imperfect competition.(c) intra-industry trade.(d) inter-industry trade.(e) None of the above.Answer: C12. If output more than doubles when all inputs are doubled, production is said to occur underconditions of(a) increasing returns to scale.(b) imperfect competition.(c) intra-industry trade.(d) inter-industry trade.(e) None of the above.Answer: A13. Intra-industry trade can be explained in part by(a) transportation costs within and between countries.(b) problems of data aggregation and categorization.(c) increasing returns to scale.(d) All of the above.(e) None of the above.Answer: D14. If some industries exhibit internal (firm specific) increasing returns to scale in each country, weshould not expect to see(a) intra-industry trade between countries.(b) perfect competition in these industries.(c) inter-industry trade between countries.(d) high levels of specialization in both countries.(e) None of the above.Answer: B精选Chapter 6 Economies of Scale, Imperfect Competition, and International Trade 7115. Intra-industry trade is most common in the trade patterns of(a) developing countries of Asia and Africa.(b) industrial countries of Western Europe.(c) all countries.(d) North-South trade.(e) None of the above.Answer: B16. International trade based on scale economies is likely to be associated with(a) Ricardian comparative advantage.(b) comparative advantage associated with Heckscher-Ohlin factor-proportions.(c) comparative advantage based on quality and service.(d) comparative advantage based on diminishing returns.(e) None of the above.Answer: E17. International trade based on external scale economies in both countries is likely to be carried outby a(a) relatively large number of price competing firms.(b) relatively small number of price competing firms.(c) relatively small number of competing oligopolists.(d) monopoly firms in each country/industry.(e) None of the above.Answer: A18. International trade based solely on internal scale economies in both countries is likely to be carriedout by a(a) relatively large number of price competing firms.(b) relatively small number of price competing firms.(c) relatively small number of competing oligopolists.(d) monopoly firms in each country/industry.(e) None of the above.Answer: D19. A monopoly firm engaged in international trade will(a) equate average to local costs.(b) equate marginal costs with foreign marginal revenues.(c) equate marginal costs with the highest price the market will bear.(d) equate marginal costs with marginal revenues in both domestic and in foreign markets.(e) None of the above.Answer: D20. A monopoly firm will maximize profits by(a) charging the same price in domestic and in foreign markets.(b) producing where the marginal revenue is higher in foreign markets.(c) producing where the marginal revenue is higher in the domestic market.(d) equating the marginal revenues in domestic and foreign markets.(e) None of the above.Answer: D21. A firm in monopolistic competition(a) earns positive monopoly profits because each sells a differentiated product.(b) earns positive oligopoly profits because each firm sells a differentiated product.(c) earns zero economic profits because it is in perfectly or pure competition.(d) earns zero economic profits because of free entry.(e) None of the above.Answer: D22. The larger the number of firms in a monopolistic competition situation,(a) the larger are that country’s exports.(b) the higher is the price charged.(c) the fewer varieties are sold.(d) the lower is the price charged.(e) None of the above.Answer: D23. The monopolistic competition model is one in which there is/are(a) a monopoly.(b) perfect competition.(c) economies of scale.(d) government intervention in the market.(e) None of the above.Answer: C24. In industries in which there are scale economies, the variety of goods that a country can produce isconstrained by(a) the size of the labor force.(b) anti-trust legislation.(c) the size of the market.(d) the fixed cost.(e) None of the above.Answer: C精选Chapter 6 Economies of Scale, Imperfect Competition, and International Trade 71 25. An industry is characterized by scale economies, and exists in two countries. Should these twocountries engage in trade such that the combined market is supplied by one country’s industry, then(a) consumers in both countries would suffer higher prices and fewer varieties.(b) consumers in the importing country would suffer higher prices and fewer varieties.(c) consumers in the exporting country would suffer higher prices and fewer varieties.(d) consumers in both countries would enjoy fewer varieties available but lower prices.(e) None of the above.Answer: E26. An industry is characterized by scale economies and exists in two countries. In order for consumersof its products to enjoy both lower prices and more variety of choice,(a) each country’s marginal cost must equal that of the other country.(b) the marginal cost of this industry must equal marginal revenue in the other.(c) the monopoly must lower prices in order to sell more.(d) the two countries must engage in international trade one with the other.(e) None of the above.Answer: D27. A product is produced in a monopolistically competitive industry with scale economies. If thisindustry exists in two countries, and these two countries engage in trade one with the other, then we would expect(a) the country in which the price of the product is lower will export the product.(b) the country with a relative abundance of the factor of production in which production of theproduct is intensive will export this product.(c) each of the countries will export different varieties of the product to the other.(d) neither country will export this product since there is no comparative advantage.(e) None of the above.Answer: C28. The reason why one country may export a product which is produced with positive scaleeconomies is(a) its labor productivity will tend to be higher.(b) it enjoys a relative abundance of the factor intensely used in the product’s production.(c) its demand is biased in favor of the product.(d) its demand is biased against the product.(e) None of the above.Answer: E29. Two countries engaged in trade in products with no scale economies, produced under conditions ofperfect competition, are likely to be engaged in(a) monopolistic competition.(b) inter-industry trade.(c) intra-industry trade.(d) Heckscher-Ohlin trade.(e) None of the above.Answer: B30. Two countries engaged in trade in products with scale economies, produced under conditions ofmonopolistic competition, are likely to be engaged in(a) price competition.(b) inter-industry trade.(c) intra-industry trade.(d) Heckscher-Ohlinean trade.(e) None of the above.Answer: C31. History and accident determine the details of trade involving(a) Ricardian and Classical comparative advantage.(b) Heckscher-Ohlin model consideration.(c) taste reversals.(d) scale economies.(e) None of the above.Answer: D32. We often observe intra-industry North-South trade in “computers and related devices.” This isdue to(a) classification and aggregation ambiguities.(b) monopolistic competition.(c) specific factors issues.(d) scale economies.(e) None of the above.Answer: A33. We often observe “pseudo-intra-industry trade” between the United States and Mexico. Actually,such trade is consistent with(a) oligopolistic markets.(b) comparative advantage associated with Heckscher-Ohlin model.(c) optimal tariff issues.(d) huge sucking sound.(e) None of the above.Answer: B34. Intra-industry trade will tend to dominate trade flows when which of the following exists?(a) Large differences between relative country factor availabilities(b) Small differences between relative country factor availabilities(c) Homogeneous products that cannot be differentiated(d) Constant cost industries(e) None of the above.Answer: B精选Chapter 6 Economies of Scale, Imperfect Competition, and International Trade 7135. The most common form of price discrimination in international trade is(a) non-tariff barriers.(b) Voluntary Export Restraints.(c) dumping.(d) preferential trade arrangements.(e) None of the above.Answer: CEssay Questions1. Why is it that if an industry were operating under conditions of domestic internal scale economies(applies to firm in the country)—then the resultant equilibrium cannot be consistent with the pure competition model?Answer: Because once one firm became bigger than another, or if one firm began the industry, then no other firm would be able to match its per unit cost, so that they would be driven out ofthe industry.2. Is it possible that if positive scale economies characterize an industry, that its equilibrium may beconsistent with purely competitive conditions? Explain how this could happen.Answer: Yes. If the scale economies were external to the firm, then there is no reason why the firms may not be in perfect competition.3. If a scale economy is the dominant technological factor defining or establishing comparativeadvantage, then the underlying facts explaining why a particular country dominates world markets in some product may be pure chance, or historical accident. Explain, and compare this with the answer you would give for the Heckscher-Ohlin model of comparative advantage.Answer: This statement is true, since the reason the seller is a monopolist may be that it happened to have been the first to produce this product in this country. It may have no connection toany supply or demand related factors; nor to any natural or man-made availability. This isall exactly the opposite of the Heckscher-Ohlin Neo-Classical model’s explanation of thedeterminants of comparative advantage.4. It is possible that trade based on external scale economies may leave a country worse off than itwould have been without trade. Explain how this could happen.Answer: One answer is that the terms of trade effects may dominate any other factors.5. If scale economies were not only external to firms, but were also external to individual countries.That is, the larger the worldwide industry (regardless of where firms or plants are located), thecheaper would be the per-unit cost of production. Describe what world trade would look like in this case.Answer: Presumably each country would specialize in some component of the final product. This would result in much observed intra-industry trade.6. Why are increasing returns to scale and fixed costs important in models of international trade andmonopolistic competition?Answer: There are many answers. Three of these are(a) Increasing returns to scale, and high fixed costs may be inconsistent with perfectcompetition. In such a case, the initial autarkic state may be a suboptimal equilibrium.For example, relative prices may not equal marginal rates of transformation. It followsfrom this that a change in output compositions associated with trade may result in anational welfare for one or both trading countries that is inferior to that associatedwith the initial autarkic conditions. Hence no “gains from trade.”(b) In a case of increasing scale economies at the firm or plant level, the determination ofwhich product will be exported by which country is ex-ante indeterminate. Therefore,deriving clear implications concerning the effects of trade on income distributionssuch as may be derived from the Samuelson-Stolper Theorem is no longer generallypossible.(c) Market structures containing positive scale economies and imperfect competition mayallow for “two-way trade,” or intra-industry trade. As in b. above, the varioustheorems derivable from the Heckscher-Ohlin model concerning directions of tradeand income distributions are no longer generally applicable.7. Explain why it may be argued that the relative importance of the intra-industry component of worldtrade is likely to lessen economic strife or confrontation (a la Stolper-Samuelson) associated with commercial policy within countries in which overall trade is expanding?Answer: In the case of the Neo-Classical H-O model, the expansion of trade will tend to increase the incomes of those factors in which the exports are relatively intense. This may createsituations in which unskilled labor’s already rel atively low relative incomes would worsenin a country such as the U.S., hence heating up “class warfare.” In the case of intra-industry trade, the expanding exports will tend to be in relatively fragmented subsets ofproducts (“brands”). Such export expan sion will have no determinant or systematictendency to affect relative factor returns in any deterministic manner.8. Explain why positive economies of scale in one (of two) sectors may establish a comparativeadvantage for the large (as compared to the small) country in the production of the commoditywhich exhibits positive scale economies.Answer: In the case of the H-O model, the actual size of the country is irrelevant in thedetermination of the direction of trade (though it may affect the equilibrium terms oftrade). When positive scale economies apply to the production of one product, the countrythat can devote more resources (in absolute terms) will be able to sell that product cheaper,and therefore will be more likely to gain a “revealed” compar ative advantage in thatproduct. This will be the country with more factors (both labor and capital)—the largercountry.精选Chapter 6 Economies of Scale, Imperfect Competition, and International Trade 71 Quantitative/Graphing Problems1. The figure above represents the demand and cost functions facing a Brazilian Steel producingmonopolist. If it were unable to export, and was constrained by its domestic market, what quantity would it sell at what price?Answer: It would sell 5 (million tons) at a price of $8/ton.2. Now the monopolist discovers that it can export as much as it likes of its steel at the world price of$5/ton. It will therefore expand for-export production up to the point where its marginal cost equals $5. How much steel will the monopolist sell, and at what price?Answer: It would sell 10 million tons at $5/ton.3. Given the opportunity to sell at world prices, the marginal (opportunity) cost of selling a tondomestically is what?Answer: $5/ton.4. While selling exports it would also maximize its domestic sales by equating its marginal(opportunity) cost to its marginal revenue of $5. How much steel would the firm sell domestically, and at what price?Answer: 4 million tons at $10/ton.5. The Brazilian firm is charging its foreign (U.S.) customers one half the price it is charging itsdomestic customers. Is this good or bad for the real income or economic welfare of theUnited States? Is the Brazilian firm engaged in dumping? Is this predatory behavior on the partof the Brazilian steel company?Answer: Good. Yes, if you define dumping as selling abroad at a price lower than domestically. No, if by dumping you mean selling below marginal cost. No—this is not being done in orderto capture market shares, but rather is “mere” static profit maximization behavior, as isexpected of any self-respecting monopolist.6. The following Table describes the labor-input coefficients needed to produce one Widget in Englandand Portugal. Both countries are identical in size, tastes, technology. This technology is described in the table below:To Produce This Many Widgets, Or This Many Apples Labor-Hour Requirements1 32 53 64 75 86 97 10Let us assume that each country has 10 labor-hours available. Further, consumers always consume an equal amount of apples and widgets.(a) How of each product will be produced in England under autarky? 2 widgets and 2 apples.(b) Judging from autarky conditions, which country has a comparative advantage in widgets?(c) If England (completely) specialized in widgets, how many widgets would be produced, and howmany apples?(d) If the world terms of trade were established at 3.5 widgets 3.5 Apples, which country wouldenjoy gains from trade (as compared to The autarky solution?)(e) If Portugal were to completely specialize in widgets, how would the answers to c and d change?(f) What would the production possibility curve look like in each country?Answers: (a) 2 widgets and 2 apples(b) None(c) 7 widgets in England and 7 apples in Portugal(d) both would gain from trade. Instead of consuming 2 widgets and 2 apples, they wouldeach consume 3.5 widgets and 3.5 apples.(e) Same numbers as c, except that the countries will each be assigned a different product.Exactly the same answer for d.(f) convex to the origin.精选。