The theoretically necessary and sufficient condition for the correspondence between `revealed'comparative advantage and pre-trade relative prices derived by Hillman (1980) is analyzed empricially for virtually all countries of the world over an extended period of time. This yields 10 stylized...

If the price is regulated in a spatial duopoly where consumers have a finite upper bound as to the price they are willing to pay for the differentiated product, in most cases the Principle of Minimum Differentiation does not apply. Depending on the market structure firms either (i) form local...