This workshop addressed a question of concern to medieval economic history for over a generation. Frederic C. Lane called for a theory of consumption, and Carlo Cipolla and Robert Lopez have encouraged a more thorough investigation of the role of demand. Because demand is sometimes understood in terms of needs and of taste, it is often subsumed under the heading of social history, which characterizes and describes, while economic analysis has centered on studies of supply, with their more precise and quantifiable parameters.Will the largely descriptive tools at our disposal help us to understand how demand affected the early-modern economy? The workshop considered demand for goods and services and demand for money. The first three papers addressed the Mediterranean south, and the last three focused upon Europe north of the Alps.