A. Roy Thurik is head of the Department of Basic Research at the Research Institute for Small and Medium-Sized Business in The Hague, Netherlands. Professor Dr.Johan Koerts is professor of Mathematical Statistics at the Econometric Institute, Erasmus University, Rotterdam, Netherlands. They study the relationship between sales and floorspace in small retail establishments, which is of importance for retail planning, shop design, efficiency diagnosis, evaluation, evaluation of the role of assortment composition, environment. Their study investigates the relationship between total available floorspace, the value of total annual sales, and the partitioning of total available floorspace for small retail establishments into selling area and remaining space.