EC120 Lecture Notes - Lecture 9: Comparative Advantage, Market Power, Opportunity Cost
EC120 – Chapter 9: Application: International Trade
- A country has a comparative advantage in a good if it produces the goo at lower opportunity
cost than other countries.
• Countries can gain from trade if each exports the goods in which it has a comparative
advantage.
• Now we can apply tools of welfare economics to see where these gains come from and who
gets them.
THE WORLD PRICE AND COMPARATIVE ADVANTAGE
- Pw = the world price of a good.
• The price that prevail the world markets.
- Pd = domestic price without trade.
- If Pw > Pd: Country has a comparative advantage in good, under free trade, country exports the
good.
- If P < Pd: Coutr does’t hae a oparatie adatage, uder free trade, country imports
the good.
THE SMALL ECONOMY ASSUMPTION
- A small economy:
• It is the price taker in world markets.
• Its action have no effect on Pw.
- Canada suits the definition of a small economy.
- When small economy engages in free trade, Pw is the only relevant price:
• No seller would accept less than Pw, since she would sell the good for Pw in world markets.
• No buyer would pay more than Pw, since he would buy the good for Pw in world markets.
- Summary: Whether a good is imported or exported, trade creates winners and losers. But the
gains exceed the losses.
OTHER BENEFIT OF INTERNATIONAL TRADE
- Consumers enjoy increased variety of goods.
- Producers sell to a larger market.
• May achieve lower costs by producing on a larger scale.
- Competition from abroad may reduce market power of domestic firms.
• Which would increase total welfare
- Trade enhances the flow of ideas
• Facilitates the spread of technology around the world.
THEN WHY ALL THE OPPOSITION TO TRADE?
- Recall one of the Ten Principles from chapter 1:
• Trade can make everyone better off.
- The winners from trade could compensate the losers and still be better off.
• Yet, such compensation rarely occurs.
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Pw = the world price of a good: the price that prevail the world markets. If pw > pd: country has a comparative advantage in good, under free trade, country exports the good. If p(cid:449) < pd: cou(cid:374)tr(cid:455) does(cid:374)"t ha(cid:448)e a (cid:272)o(cid:373)parati(cid:448)e ad(cid:448)a(cid:374)tage, u(cid:374)der free trade, country imports the good. It is the price taker in world markets. Canada suits the definition of a small economy. Summary: whether a good is imported or exported, trade creates winners and losers. Producers sell to a larger market: may achieve lower costs by producing on a larger scale. Competition from abroad may reduce market power of domestic firms: which would increase total welfare. Trade enhances the flow of ideas: facilitates the spread of technology around the world. Recall one of the ten principles from chapter 1: trade can make everyone better off. Hence, the losers have more incentive to organize and lobby for restrictions on trade.