How Much Did the Liberty Shipbuilders Learn? New Evidence for an Old Case Study

This paper uses previously unavailable historical records to show that several assumptions central to a learning by doing explanation of productivity growth in the construction of Liberty ships during World War II are mistaken. Impressive increases in output per worker recorded at one of the largest shipyards in the program, Calship, are shown to be strongly associated with increases in capital intensity and with a reduction in quality, where the latter is measured by the probability of a ship developing serious fractures that threatened the lives of its crew. Capital deepening and quality change, in conjunction with changes in production technologies and capacity utilization, account for virtually all the increase in labor productivity.