Note to players: specific terms required. These two terms name John Friedmann's model of polarized urban development. Samir Amin's concept of “delinking” calls for separating the economies of concepts described by these two terms. (-5[1])Paul Krugman used these two terms to describe differentiated (15[1])sectors (15[1])of a country in the paper “Increasing Returns and Economic Geography.” A (15[1])“semi-” version of one of these two concepts (15[1])is added in (*) world-systems theory. The existence of an exploitative relationship between these two (10[1])regions is the common extension of the Prebisch-Singer thesis and is the central contention of dependency theory. For 10 points, name these two conceptual regions in international political economy, one of which is wealthy and central, the other impoverished and fringe. ■END■ (10[1])