A rabbi and a priest are in a field of strawberries dotted with tall apple trees. In order to meet their Maker, they must thoroughly harvest their hectare. The priest is 7 feet tall; the rabbi is a pisher (5 feet tall, for those of you not fluent in Yiddish). Who should do what?
Duh. The tall guy picks the apples; the short guy harvests the strawberries. Easy call. That’s comparative advantage – the rabbi is vertically-challenged so he has a comparative advantage picking things low whereas the priest is high so he may pick unforbidden fruit.
The notion follows that countries have similar advantages: Kiwi grows easily in New Zealand, and not so easily in Saudi Arabia. Now Saudi gardeners could probably build shade, import soil, and mist-ify water to try and replicate the natural conditions of New Zealand but… why? Why not just let the Kiwis grow their kiwis and ship ‘em (on boats powered by Saudi oil…).
Before we get too carried away, let's stop for the four key terms you're going to need to master to fully understand international trade:
Did we lose you around opportunity cost?
Let’s think about these in terms of individuals instead of nations and choices we all understand... like trying to decide whether to become a fry cook or a heart surgeon. (That's a debate we have internally just about every single day.)
Let’s say you're a wonderful fry cook and a talented heart surgeon. Your neighbor is a pretty good fry cook and (since he is near-sighted and has a severe hand tremor) an absolute butcher as a surgeon.
You have an absolute advantage over your neighbor as a fry cook. He just can’t hang with you around a pan of sizzling lard. And you also possess an absolute advantage over him as a surgeon—your patients actually survive their surgeries occasionally.
Which career should you pursue? To become a fry cook, you must sacrifice your far more lucrative work as a heart surgeon; your opportunity cost is very high. On the other hand, your moderately skilled fry-cooking neighbor has a relatively low opportunity cost—to pursue a career as a fry cook he only has to sacrifice his malpractice-suit-waiting-to-happen career as a surgeon. Therefore your neighbor has a comparative advantage in fry cooking... even though you're objectively a better fry cook than he is.
The real world is far more complicated than this. But David Ricardo, an early nineteenth-century British economist, argued that these simple principles can be used to explain international trade. Countries, not just individuals, possess certain advantages. Climate, geography, the skills and size of their labor force, the ability to grow or not grow kiwi fruit—these all contribute to make a country good at producing certain things. And countries, like individuals, also have to make certain sacrifices in deciding which of the goods that they can produce they should produce—to produce corn instead of wheat, cars instead of boats, computer chips instead of refrigerators. Being rational operators, they eventually produce those products in which they have a comparative advantage, those goods having a comparatively low opportunity cost.
As a result, we have international marketplace filled with all sorts of good stuff. Countries identify their comparative advantages and sell the resulting goods in the international market. Brazil sells coffee, Estonia builds ships, and Palau exports coconuts. These are the fruits of comparative advantage.
|America's Leading Exports(in billions of dollars)||America's Leading Imports(in billions of dollars)|
|1||Civilian Aircraft||74||1||Crude Oil||341.9|
|4||Pharmaceutical Preparations||40||4||Car Accessories||64.9|
|5||Car Accessories||39.9||5||Other Household Goods||61.6|
|6||Other Industrial Machines||38.1||6||Computer Accessories||60.2|
|7||Fuel Oil||34.9||7||Oil Products||52.3|
|8||Organic chemicals||33.4||8||Cotton Apparel||49.5|
|10||Plastic Materials||31.6||10||Video Equipment||41|
Why It Matters Today
Do you know what you want to be when you grow up? Choosing a career is one of the most important choices you'll make in your entire life. If don't want to make the wrong choice, you'd better think about comparative advantage—both your own as an individual and your country's in the international market.
If you're living in the United States, it really doesn't matter if you're the world's most talented stitcher of men's underpants. Other nations where labor is much cheaper (hey there, Indonesia!) have such a strong comparative advantage over the high-wage United States in the underwear assembly industry that you'll never be able to find and keep a job in that field.