Paul Krugman of Princeton won the Nobel Prize in Economics this morning. Here's the Nobel Committee press release:
Patterns of trade and location have always been key issues in the economic
debate. What are the effects of free trade and globalization? What are the driving
forces behind worldwide urbanization? Paul Krugman has formulated a new
theory to answer these questions. He has thereby integrated the previously disparate
research fields of international trade and economic geography.
Krugman's approach is based on the premise that many goods and services can
be produced more cheaply in long series, a concept generally known as economies
of scale. Meanwhile, consumers demand a varied supply of goods. As a result, small-scale
production for a local market is replaced by large-scale production for the world
market, where firms with similar products compete with one another.
Traditional trade theory assumes that countries are different and explains why
some countries export agricultural products whereas others export industrial goods.
The new theory clarifies why worldwide trade is in fact dominated by countries
which not only have similar conditions, but also trade in similar products –
for instance, a country such as Sweden that both exports and imports cars. This
kind of trade enables specialization and large-scale production, which result
in lower prices and a greater diversity of commodities.
Economies of scale combined with reduced transport costs also help to explain
why an increasingly larger share of the world population lives in cities and why
similar economic activities are concentrated in the same locations. Lower transport
costs can trigger a self-reinforcing process whereby a growing metropolitan population
gives rise to increased large-scale production, higher real wages and a more diversified
supply of goods. This, in turn, stimulates further migration to cities. Krugman's
theories have shown that the outcome of these processes can well be that regions
become divided into a high-technology urbanized core and a less developed "periphery".
Tyler Cowen (Paul Krugman wins the Nobel Prize) and Alex Tabarrok (What is New Trade Theory) explain the science and its significance. Arvind Subramanian's 2006 profile is a very good introduction: Economist as Crusader. After the announcement, Krugman provided links to an autobiography and a short essay on how he works, at his weblog: A bit of autobiography. The Economist: Bold Strokes. A strong economic stylist wins the Nobel prize.
Photo from article on Krugman by Arvind Subramanian in IMF's Finance & Development