This volume includes seven papers in quantitative economic history. Four were accepted through our regular channels. These include Harald Edquist and Magnus Henrekson on "Technological Breakthroughs and Productivity Growth," Scott Redenius on "New National Bank Loan Rate Estimates, 1887-1975," Ebru Guven Solakoglu on the "Net Effect of Railroads on Stature in the Post Bellum Economy," and Pedro Lains on "Growth in a Protected Environment, Portugal, 1850-1950." Three papers are from a 2004 conference, Towards a Global History of Prices and Wages. These include Metin Cosgel on "Agricultural Productivity in the Early Ottoman Empire," Johan Soderberg on "Grain Prices in Cairo and Europe in the Middle Ages," and Jun Seong Ho and James Lewis on "Wages, Rents, and Interest Rates in Southern Korea, 1700 to 1900."