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.