Question:
- What is the difference between absolute advantage and comparative advantage?
Answer: -
The term absolute advantage emerges when considering multiple
products. If A has an economic advantage against B at producing X, and A has an
economic advantage against B at producing Y, then we say that A has an absolute
advantage against B with respect to products X and Y. Notice that a claim such
as “India has an absolute economic advantage against the US” is odd for two
reasons. Firstly, such an advantage, unqualified, must refer to all goods and
services. Since universal empirical claims are notoriously troublesome to
prove, this raises a red flag. Secondly, aggregating costs within an industry
(for instance, wages paid to workers per shirt produced) has meaning for
businessmen in that line of business, while aggregating costs across an entire
nation and over all goods is highly problematic, for the same reason that all
aggregates of this sort are problematic — the subjective nature of cost. But,
this is not the main issue. The main issue is:
The concept of comparative
advantage emerges when
considering trade. At first glance, there is no reason to think that A, with
absolute advantage against B in goods X and Y, would wish to trade either X or
Y with B. Another worry is that if B trades in either X or Y with A, he might
harm his interests. These initial impressions are completely exploded by
considering the nature of trade, and Ricardo’s discovery of the law of
comparative advantage. It is not absolute advantage that is relevant when
considering the gains to trade — it is comparative advantage.
Comparative advantage, when confined to considering goods X and
Y, refers to the relative costs of a marginal unit of X per marginal unit of Y.
That is, if A enjoys absolute advantage, he is still in a position such that
the cost of foregoing production of enough units of Y to produce a unit of X
means that he would be willing to trade X for Y at a ratio that is favorable to
his position. The same is true for B, and if these ratios are not equal, then
the direct benefits of trade emerge.
Indeed, the only condition for direct benefits of trade is that
the substitution ratio for A be different from the substitution ratio for B.
When the substitution ratio of X to Y for A is greater than that of B’s, then
we say that A has a comparative advantage in X, and at the same time, B has a
comparative advantage in Y. It then becomes mutually advantageous for A
exclusively to produce X and B exclusively to produce Y — division of labor.
The existence of comparative advantage is always mutual and
reciprocal.
While the law of comparative advantage was explicated and the
benefits of free trade explained by Ricardo under a certain set of assumptions
(mobility of labor, but not of trade) does not imply that the law of
comparative advantage depends upon those assumptions — it does not.