Perhaps a loose criterion for judging the desirability of different market structures is American economist William Baumol's concept of "contestable markets": if a market is easy to enter and to exit, it is "contestable" and hence workably competitive.
With Baumol, Bailey had worked on the theory of contestable markets — the idea that when there are no costs for entering or exiting a market, companies will behave competitively.
Relating current theoretical work to the main body of trade theory, Helpman and Krugman review and restate known results and also offer entirely new material on contestable markets, oligopolies, welfare, and multinational corporations, and new insights on external economies, intermediate inputs, and trade composition.
The combined analysis applied to the railway sector of all the previous (productivity and technology efficiency, discreet modal choice and contestable markets) has provided interesting results.
The liberalisation of the air and railway transport sectors instigated expanding the scope of the studies in to areas such as structures for contestable markets, competitiveness and regulation [3].
The idea of contestable markets and vendor relationships--where low barriers to market entry makes it easy to change suppliers as necessary--has not been fully embraced by the Pharma industry as yet.
The collection provides an overview of his professional activities, including his research on the cost disease, unbalanced growth, productivity growth, entrepreneurship, increasing returns and international trade, anti-trust policy, contestable markets, market structure, macroeconomic theory, and interest rate and monetary theory, among other topics.
Research notes include files on Baumol's work on anti-trust policy, the theory of fairness, the cost disease, contestable markets, entrepreneurship, economics and education, history of economic thought, innovation and technological progress, industrial organization, economics of the performing arts, and productivity growth, among other topics.
The announcement earlier this week that China would end its controversial wind subsidy program is welcome, but is only the tip of the iceberg when it comes to ensuring open, contestable global markets for environmental technologies.
Instead, top managers still viewed each market as "contestable"—as a potential opening for rivals if Wal-Mart ceased to give the maximum possible value to customers.
