This article focuses on the introduction, diffusion and function of coinage in Sybaris and Metapontium, cities considered the first to mint coinage in southern Italy. In this paper, there is an effort to combine a series of numismatic data along with non-numismatic ones in order to draw broader conclusions on the introduction of coinage and its impact on the societies of these two poleis. The main argument is that coinage was introduced in order for the elite, rich landowners governing the (...) cities to profit from selling their agricultural products. Nevertheless, the demos benefited also from coinage, as the minting of fractions reveals. This group also had a certain political power in these two cities and their interests were taken into consideration by the ruling elites. The spread of the coinage of these two cities in southern Italy and other areas suggests that ultimately coinage served, already from the Archaic period, as an important tool for all kinds of economic transactions of which trade constituted the greatest part. (shrink)