Chapter 6 chronicles how money as social technology was reconfigured during the eighteenth and nineteenth centuries. It examines economic and philanthropic discourse as well as government practice between 1750 and 1850 to explain the motives for a quick succession of currency reforms in the nineteenth century, that profoundly transformed the material properties of public money in circulation. Cheap but precise mass production was especially important in order to issue low-denomination coins, used primarily for wage payments and retail, that would be fully conversant with the official monetary standard. In order to explain why the Dutch came to take a more hostile stance towards multiple currencies circulating in their territory, the chapter delineates how a 'national economy', forged through monetary exchange, became first an ideological and then a bureaucratic reality. While national currency did not do away with plurality of money in use, especially in the Dutch–Prussian borderland that is the main locale of this book, the strong discourse of technological superiority of uniform, centrally managed currency made it more difficult to think about plurality as something other than chaos.