Those developments by this man are called "new economic geography" and "new trade theory" models.
One of this man's contributions gives the endogenous development of "cores" and "peripheries" in a general equilibrium framework as an attempt to understand the development of cities. Another of his contributions explored the role of increasing returns to scale and imperfect competition in international trade that did away with Ricardo's model of comparative advantage. Those developments by this man are called "new economic geography" and "new trade theory" models. He is better known for writing books such as The Return of Depression Economics. For 10 points, identify this Princeton economist who won the 2008 Nobel Prize and who wrote The Conscience of a Liberal.
One of this man's contributions gives the endogenous development of "cores" and "peripheries" in a general equilibrium framework as an attempt to understand the development of cities.
Paul {Krugman}