Do Patent Pools Encourage Innovation? Evidence from the 19th-Century Sewing Machine Industry
---- Acknowledgements -----
We wish to thank the Wisconsin State Historical Society for granting access to the Singer Archives, and Eric Hilt, Jim Bessen, Paul David, Ross Thomson, and seminar participants at the Santa Fe Institute, the Stanford Junior Faculty Lunch, and Stanford's Social Science History Workshop for helpful comments. Luke Brennan and Marina Kutyavina provided valuable research assistance. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.