NEXT to John Law's Banque Royale, the most important mercantilist monetary experiment attempted in western Europe during the pre-Adam Smith era took place in Sweden. The Bank of Sweden (Riksens Ständers Bank), which had been established as a national bank in 1688, was used by the Swedish government in the mid-eighteenth century as an engine for economic development. Sweden's experiment in paper money mercantilism gave rise to an active debate which may be called the “Swedish bullionist controversy” because of its similarity to the monetary debate in England at the outset of the nineteenth century. This controversy took place in a highly charged political environment. Political power in Sweden from 1739 to 1772 was centered in the Swedish Riksdag, a representative body composed of the Four Estates: burghers, nobles, clergy, and peasants. Within this organization, the mercantile class predominated by virtue of its control of the influential House of Burghers when the Riksdag was in session and its control of the Secret Committee, which directed government policy when the Riksdag was not in session. The two political parties—the Hats and the Caps—vied with one another for control of the government from 1739 to 1772, a span including most of the epoch known in Swedish history as the “Age of Freedom,” 1719–1772. Participants in the bullionist controversy typically fell into one or the other political camp, and the political element is strong in most of the economic literature of the period. The two political parties locked horns on the issue of the “correct” monetary policy. At stake in the struggle was not only the correctness of economic theories and policies but, ultimately, also the viability of the Swedish parliamentary form of government. It is the purpose of this article to review the policies of the Riksbank in the mid-eighteenth century and to examine the economic theories of the two contending political parties.