EC120 Lecture Notes - Lecture 9: Comparative Advantage, Market Power, Opportunity Cost

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17 Jan 2018
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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: Coutr does’t hae a oparatie adatage, uder 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.

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