This is a full-scale study of prices in medieval Scotland, c. 1260-1542, which includes detailed discussions of coinage, and weights and measures. Nearly 6,000 prices are listed individually, average prices are calculated for each commodity, and for groups of commodities such as cereals and livestock. Scots prices are compared with English, and the significance of the data for the economic history of medieval Scotland is analysed fully. This is the only full study to have been undertaken on Scots medieval prices, and there is no comparable work on Scottish medieval economic history in print.