1. Chapter 5: Alternative Theories of Trade
Topics in chapter 5:
Standard trade theory has increased difficulties in explaining real world trade flows - there is a need for alternative theories
Intra-industry trade
Product differentiation and monopolistic competition
Oligopoly and trade

2. Trade and comparative advantage
Trade based on theories of comparative advantage focus on the supply side of the economy - countries trade because they are “different”
The H-O model explains “resource based” trade well - e.g. trade for DCs to LDCs, trade in natural resources, etc.
Countries which are “similar” should only trade a little with each other

3. Trade based on Product Differentiation
A large portion of the output of modern economies today involves differentiated rather than homogenous products
As a result, a great deal of international trade can and does involve the exchange of differentiated products of the same industry or broad product group
A great deal of international trade is intra-industry trade in differentiated products, as opposed to inter-industry trade in completely different products

4. Intra - Industry Trade
The level of intra-industry trade can be measured by the intra-indystry trade index (T), where X and M measure respectively the value of exports and imports

5. IIT - Industrial Countries

6. IIT - Developing Countries

7. Formal models of IIT
Different demand conditions are important, but are not the only important factor
A producer cannot make every conceivable variant of a product - would loose economies of scale in production
Internal - expansion of the firm itself
External - expansion of the industry

8. Monopolistic competition
If scale economies are modest or moderate, there is room for a large number of firms
Many firms selling a differentiated product with easy entry or exit from the industry - monopolistic competition

9. Monopolistic competition
Price AC MC D MR
Quantity

10. Intra- and inter-industry trade
Suppose we have two nations, 1 and 2, and two goods, X and Y
Nation 1: labour abundant
Nation 2: Capital abundant
Good X: labour intensive
Good Y: capital intensive
Which trade pattern will we observe ?

11. Intra- and inter-industry trade
If X and Y are homogenous, nation 1 will export X and import Y, while nation 2 will export Y and import X, as postulated by the H-O theory
This is inter - industry trade and reflects comparative advantage only

12. Intra- and inter-industry trade
If there are different varieties of X and Y are (X and Y are differentiated), nation 1 will still be a net exporter of X (inter- industry trade, based on comparative advantage), but will also import some varieties of X and export some varieties of Y (intra - industry trade, based on product differentiation and economies of scale)

13. Gains from trade
There will be an increase in the varieties of goods which become available through imports
Increased international competition can lower prices
Distribution of factor income has not been much affected, exports may make up for loss of domestic market share due to imports

14. Effects of increased market size

15. Economies of scale X Y

16. Economies of scale
It is a matter of complete indifference which of the two nations specialise in the production of X or Y - the trade pattern may be random
If scale economies exist over a sufficiently long range of outputs, one or a few firms will capture the entire market
monopoly
ologopoly