7. Services. Although the theories of absolute and comparative advantage were
developed from the perspective of trade in commodities, much of the same
reasoning can be applied to trade in services.
8. Production Networks. While both theories deal with the trading of one product for
another, increasingly there are divisions by components and function as well as
within a company’s value chain network. The firm’s value chain can include a
number of countries; however, the argument for specialization still remains valid.
9. Mobility. Neither the assumption that resources can move domestically from the
production of one good to another at no cost, nor the assumption that resources
cannot move internationally, is entirely valid. Nonetheless, domestic mobility is
greater than the international mobility of resources. Clearly, the movement of
resources such as capital and labor is a very real alternative to trade.
III. THEORIES TO EXPLAIN NATIONAL TRADE PATTERNS
The free trade theories demonstrate how output growth occurs through specialization and
free trade; however, they do not deal with trade patterns such as how much a country
trades, what products it trades, or who will be its trading partners. In this section, we
discuss the theories that help explain these patterns.
A. How Much Does a Country Trade?
Apart from nontradable goods, i.e., goods and services that are impractical to export,
country size helps to explain why some countries are more dependent on trade than
others and why some account for larger portions of world trade than others.
1. Theory of Country Size. The theory of country size holds that large countries
tend to export a smaller portion of their output and import a smaller portion of their
consumption. Large countries are more apt to have varied climates and a greater
assortment of natural resources than smaller economies, thus making the large
countries more self-sufficient. Further, given the same types of terrain and modes
of transportation, the greater the distance, the higher the associated transport
costs. Thus, firms in large countries often face higher transportation costs in terms
of sourcing inputs from and delivering output to distant foreign markets than do
their closer foreign competitors.
2. Size of the Economy. Countries can be compared on the basis of their economic
size, using indicators that include the value and share of world trade. Ten of the
world’s top trading nations are high-income countries. Despite its low per capita
income, China also has a large economy because of its very large population.
Together, the top ten nations account for more than one-half of all of the world’s
trade. [see Map 6.2].
B. What Types of Products Does a Country Trade?
The composition of a country’s trade depends on both its natural and acquired
advantages. With respect to the latter, both production and product technology can be
very important.
1. Factor-Proportions Theory. Developed by Eli Heckscher and Bertil Ohlin, the
factor-proportions theory holds that countries have their best trade advantage
when depending on their relatively abundant production factors. The following are
few observations about the factor-proportions theory:
a) Factor proportions theory appears logical, and a general observation gives
many examples that conform to the theory;
b) The factor proportions theory assumes production factors to be homogeneous,
tests to substantiate the theory have been mixed;
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