The quantification of the monetary supply in Greco-Roman times is a desired goal set by historians of the ancient economy before the Second World War. In the 1970s and 1980s, many statistical methods were proposed in order to estimate the original number of dies used to produce a particular coinage. Despite initial strong skepticism, a consensus has now been achieved regarding the legitimacy of such methods. But the real goal of the historian is to estimate the approximate numbers of coins issued, and this requires the use of historical evidence. In the1990s, a fierce debate erupted regarding the key question of the average productivity per die between those who claim that the uncertainty is too large to draw any meaningful conclusions, and those who argue that such calculations are nonetheless helpful in many circumstances. This book offers an up-to-date view of where we are today, with eighteen papers reflecting different levels of support for such calculations. The first seven papers deal with historiography and methodology, while the following ones are devoted to case-studies: nine Greek, covering Athens, Ionia, South Italy and Sicily, the Seleucids, Palestine, and Thasos, and two dealing with Roman coinage.