By contrast, nomads, long-distance traders, and former-nomad warrior conquerors favored portable wealth in the form of coins that could travel across cultural territories of social difference within which noncoinage money forms prevailed. Deyell has an excellent map of the spatial expansion of coin-based economies in North India (184), which indicates that the eastern Gangetic Basin was on a moving coin-frontier driven by mobile warrior rulers who arrived to conquer, consolidate, and coinify Bengal in the thirteenth century. [Extracted from the article]