The brander-krugman model

Extended Essay 1

The Brander-Krugman theoretical account, besides known as the mutual dumping theoretical account, explains the possibility of international trade in a homogeneous good. In making so, it raises an interesting issue: is this seemingly unpointed trade socially good? Meanwhile, Corden developed a more realistic imposts brotherhood ( CU ) theory compared to orthodox theory by loosen uping the premise of changeless fringy costs ( MC ) . While the model of these two theoretical accounts are similar, their decisions are really different, the grounds for which are discussed farther below.

a )

Both theoretical accounts are set in a partial equilibrium model ; the monetary values of all replacements and complements of the good in inquiry are assumed to be changeless, as are the income degrees of consumers, leting for an easier analysis of public assistance additions from the formation of the imposts brotherhood ( CU ) .

Within this model, there is a individual manufacturer in each of the CU states that produces a homogeneous good. The other similarity between the two theoretical accounts is that the duties set and faced by both states ( Home ( H ) and Partner ( P ) ) before CU formation are equal.Thus, when the brotherhood is created a Common External Tariff ( CET ) already exists. Corden develops his theoretical account in farther phases to include made-to-measure duties so that the CET has to be set upon CU formation. It is assumed that this will be set lower than the original duties that were imposed.

The states organizing a CU in Corden ‘s theoretical account are little comparative to the remainder of the universe ( R ) , connoting that its formation will hold no consequence on universe monetary values. In the Brander-Krugman theoretical account, all three states ( R is represented as one state ) are indistinguishable in size.

Symmetry is assumed between the houses in the Brander-Krugman theoretical account therefore the houses in each of the states face the same changeless marginal cost and domestic demand maps, contrary to Corden.

Corden relaxes the premise of changeless fringy costs ( MC ) that is held in Orthodox imposts brotherhood theory, and assumes alternatively that the houses benefit from internal economic systems of graduated table and therefore face worsening fringy and mean cost ( AC ) curves. Figure 1 shows that the minimal point of the houses ‘ AC curves is above the monetary value paid for imports ( autopsy ) . Hence a duty is necessary to protect domestic production, which is set at T- autopsy and prevents R from importing to H and P. The domestic monetary value being equal to the houses ‘ AC, they operate at a normal net income. The monetary value received for exports ( post exchange ) is assumed to be lower than autopsy as H and P besides face duties. Therefore, their AC is greater than post exchange and so they can non export their goods either. Therefore, unlike in the Brander-Krugman theoretical account, there is no international trade prior to CU formation.

The chief feature of the Brander-Krugman theoretical account is that the houses display Cournot behaviour – the houses make determinations about their ain end product degrees to maximize their net incomes presuming that the end product degrees of the other manufacturers will non alter [ 1 ] . This is non needfully the instance in Corden ‘s theoretical account.

B )

The being of internal economic systems of graduated table in Corden means that efficiency and public assistance additions could be increased if a individual house increases its end product and captures both markets following CU formation. This, along with the premise that the houses face different cost maps, leads to the decision that the house with the higher AC will go out the market and import the good from the house that can bring forth it at a lower cost ( this essay will presume that the spouse house exits the market ) . The premise that the spouse house operated at a normal net income pre-CU indicates that there will be no loss of manufacturer excess and no public assistance loss in P as it exits the market.

Conversely, the symmetricalness between the houses in Cournot means that neither house in the CU has a cost advantage over the other. Therefore, both the place and spouse states benefit from CU formation by increasing trade with each other, ensuing in an addition in end product for both houses ( Appendix, equation ( 1 ) ) . Although H and P have increased their overall end product, the measure they supply in each of their domestic markets lessenings ( equation 2 ) .

Although there is an overall addition in public assistance in both theoretical accounts as a consequence of CU formation, the beginning of these additions differ. Both the place and spouse states experience a public assistance addition from CU formation in Cournot given the symmetricalness, whereas merely the place state benefits in Corden as the spouse house exits the market.

In Cournot, the monetary value falls in the markets ( equation 3 ) and therefore the public assistance addition is mostly reflected by an addition in consumer excess ( equation 4 ) in both the place and spouse markets. The states besides lose public assistance through a autumn in duty gross ( equation 5 ) and the houses ‘ net incomes may lift or fall depending on the snap of the aggregative demand in the CU ( equation 6 ) . However, H ‘s overall public assistance addition is shown to be ever positive ( equation 7 ) .

In Corden, the premise that the place and spouse states are little compared to the remainder of the universe implies that the CU houses are non big plenty to vie with the outside house and hence the CU formation will non impact universe monetary values. This, along with the premise that the staying house within the CU maximises his net income by bear downing right up to the ‘import-preventing ‘ monetary value, which is the universe monetary value plus the CET, means that the monetary value will stay unchanged. Therefore, the increased public assistance is due to an addition in the staying house ‘s manufacturer excess ( figure 1, a+ & A ; szlig ; ) as the autumn in mean cost ( to J, figure 1 ) is non passed onto consumers. However, if made-to-measure duties are assumed and the CET is lower than both the initial duties, a monetary value decrease will be induced in both states and some of the public assistance addition will be passed onto consumers.

The symmetricalness in Cournot and distinction in Corden besides lead to different decisions with regard to the impact on the remainder of the universe.

In Corden, the CU formation does non impact R ‘s public assistance under the premise that there was no international trade pre-CU and there is still none post-CU. In Cournot, the autumn in R ‘s end product ( equation 8 ) and the monetary value bead in H and P impact negatively on the R house ‘s net incomes ( equation 9 ) . As ingestion and imports in R remain unchanged, R ‘s public assistance is reduced.

The chief premises that lead to the different decisions are those of symmetrical costs in Cournot and distinction in Corden. This affects how the public assistance additions are divided amongst the states every bit good as how they are split between the manufacturers and consumers.

degree Celsiuss )

In discoursing the rightness of the theoretical accounts to the EU state of affairs, the relevancy of the premises and the predicted consequences, and how the causes of these consequences compare with world need to be considered.

There are many surveies that analyse how EU integrating has affected trade flows in footings of trade creative activity and trade recreation. Trade creative activity is defined as intra-EU imports replacing domestic production ; trade recreation as EU imports replacing imports from the remainder of the universe.

By 1992, bilateral trade between any two EC states was 65 % higher than if the EC had non existed, back uping both theoretical accounts ‘ anticipations that trade between the place and spouse states increases. [ 2 ] Over the period from 1959/60 to 1977, which includes both phases of integrating for the EC and EFTA states, one-year trade creative activity was estimated at $ 20-31 billion and merchandise recreation at $ 5-8 billion. [ 3 ] This affirms the Cournot anticipation that the spouse house would increase its imports to the place state at the disbursal of both domestic production and imports from the remainder of the universe.

A survey by the Single Market Review on the impact of the Single Market Programme ( SMP ) on trade creative activity and trade recreation gives a elaborate penetration into the relevancy of the Corden and Cournot theoretical accounts to the EU state of affairs. [ 4 ] Its informations and analysis focal points on industries within the fabrication sector, peculiarly the 15 industries that were likely to be peculiarly sensitive to the SMP. [ 5 ]

Although there are some industries near to hone competition with a concentration ratio of 0.00 or 0.01 – such as vesture and boiler doing – most industries within the EU are comparatively oligopolistic harmonizing to their mean concentration ratios.

The premise of perfect information is improbable to keep true. In many economic theories where this is assumed, it is extremely unrealistic, particularly with respects to the reactions of a house ‘s rivals to the brotherhood formation.

While Cournot assumes that houses face a changeless MC, a 50 % decrease in end product from the minimal efficient graduated table of end product led to an addition in AC, and hence MC, in all the industries analysed, therefore bespeaking the presence of economic systems of graduated table.

The premise that all houses display Cournot behavior does non ever keep in the context of the EU. Through a comparing of the alterations in the price-cost borders and in the place house ‘s market portion in the domestic industry, it is apparent that industries reacted in two really different ways. One group, including office machines and pharmaceutical merchandises, experienced big cuts in their price-cost borders and a comparatively little alteration in their market portion, while the antonym is the instance for the other group. It appears that the first group decided to cut down its monetary values alternatively of losing market portion, connoting that some houses do non vie on end product but on monetary value. However, the consequence of alterations in competitory behavior by houses on market portions was highly little for most industries and states, though it was normally more of import in the smaller EU states. [ 6 ] Thus, alterations in houses ‘ behaviors are comparatively undistinguished in impacting market portions, compared to other factors.

The premise of symmetrical houses is, once more, an unrealistic 1. Given that the state sizes within the EU are really different, it is extremely likely that houses across the EU faced different market sizes and domestic demand maps before integrating, and as a consequence, they are improbable to be the same size or have the same cost maps.

In footings of the impact of the CU formation on the industries, most of the consequences predicted in Cournot keep true from 1900-94, the period examined in this SMR study.

The price-cost borders in the 15 ‘sensitive ‘ industries fell by an norm of 3.9 % , while they fell by 3.6 % in the fabrication sector as a whole. The extent of this bead in each industry depends on the behavior of the houses.

The impact of the SMP on the several market portions in the fabrication sector as a whole is negative for the place industries, and positive for both the EU and the remainder of the universe ‘s market portions in the place state. Cournot ‘s theoretical account right predicted that the place house would sell more while the spouse house would sell less in the place market. However, it predicts that the remainder of the universe ‘s portion of the place market would fall. The SMR carried out two ex-post simulations ; one with no direct external trade effects and one with. All of Cournot ‘s anticipations sing alterations in the market portions hold true for the former simulation. However, the latter simulation is more accurate in reflecting the existent alterations in market portions that were experienced over this integrating period. This implies that the Cournot theoretical account does non take into history the increasing liberalization of external trade over this period that besides led to a decrease in extra-EU trade costs, either as a consequence of the CU formation or due to increasing globalization.

In footings of public assistance, the alterations support Cournot ‘s anticipation that public assistance increased in both H and P. The alteration in public assistance measured as a per centum of GDP was greater than the per centum alteration in GDP in each of the EU states analysed.

The chief end of making the individual market in the EU was to increase its fight with regard to big economic systems such as the USA through economic systems of graduated table. This implies that Corden ‘s theoretical account should offer a more accurate image of the EU. However, certain premises do non reflect the EU ‘s features.

The premise that the CU-forming states are little may keep true for some of the EU states ; nevertheless, the deduction of this that the imposts brotherhood will be unable to impact universe monetary values may non keep. Given the size of the EU, it is big plenty to vie with the big economic systems such as the USA and Japan.

Corden ‘s anticipations sing alterations in monetary value and market portions are non appropriate to the EU state of affairs, due to the strong premises that there was no international trade prior to the formation and therefore no trade with the remainder of the universe after. Besides, with the spouse house go outing the market, it is assumed that there is no addition in competition following CU formation, therefore no alteration in the monetary values.

However, there is grounds back uping the chief decision of this theoretical account that the public assistance addition is a consequence of restructuring, which leads to progressively concentrated industries as houses can profit from economic systems of graduated table as the size of the market that they have entree to additions. Between 1987 and 1993, the four-firm concentration ratio increased by 2.3 % across 71 industries in the EU. [ 7 ] This was partially due to increased restructuring ; between 1987 and 1990, the per centum of M & A ; As affecting states from two different member provinces jumped from 9.6 % to 21.5 % in expectancy of the Single Market. This replaced M & A ; As within state boundary lines which fell from 71.6 % to 60.7 % over the same period. [ 8 ]

While it is true that EU industry concentration has increased, this is can non be attributed entirely to an enlargement in the market size. Many industries already operated internationally in the 1980s and therefore, a market size enlargement would non hold had as large an impact on the concentration degree. The individual market besides led to a decrease in non-tariff barriers ( particularly barriers to entry ) between EU member provinces, through public procurance liberalization, increased easiness of cross-border cognition transportation and the free motion of capital. Corden ‘s comparative inactive theoretical account fails to take into history the dynamic effects of EU integrating.

The purpose of the SMP was much more ambitious than a mere riddance of the duty barriers and therefore both theories, which focus on the effects of a CU, are excessively simplistic to be entirely appropriate. Certain facets of both theoretical accounts are comparable to the EU state of affairs. However, Corden ‘s theoretical account seems to be more suited ; while Cournot ‘s consequences sing alterations in the monetary values and several market portion were more accurate, Corden ‘s implicit in features are much more appropriate to the current EU state of affairs.


  1. Friedman, James ( 1983 ) , ‘Oligopoly Theory ‘ , Cambridge University Press
  2. Frankel ( 1997 ) ( Ali El-Agraa P175 )
  3. Kreinin ( 1979b ) ( Ali El-Agraa P175
  4. European Commission/CEPR ( 1997 ) Trade Creation and Trade Diversion, Subseries IV/ volume 3 of The Single Market Review
  5. Buigues, Ilzkovitz and Lebrun ( 1990 )
  6. EC/CEPR, 1997, Trade creative activity and trade recreation
  7. Subseries V, Volume 4, Economies of Scale
  8. AMDATA in European Economy ( 1999 )