Abstract: The Plant Patent Act of 1930 was the first step towards creating property rights for biological innovation: it introduced patent rights for asexually-propagated plants. This paper uses data on plant patents and registrations of new varieties to examine whether the Act encouraged innovation. Nearly half of all plant patents between 1931 and 1970 were for roses. Large commercial nurseries, which began to build mass hybridization programs in the 1940s, accounted for most of these patents, suggesting that the new intellectual property rights may have helped to encourage the development of a commercial rose breeding industry. Data on registrations of newly-created roses, however, yield no evidence of an increase in innovation: less than 20 percent of new roses were patented, European breeders continued to create most new roses, and there was no increase in the number of new varieties per year after 1931

Abstract: During the nineteenth century, the US manufacturing sector shifted away from the "hand labor" mode of production, characteristic of artisan shops, to the "machine labor" of the factory. This was the focus of an extremely detailed but extraordinarily complex study by the Commissioner of Labor published in 1899 that has until now defied systematic analysis. Here, we explore the overall productivity gains associated with these changes in production methods and the specific, causal role of inanimate power. Under the machine labor mode, the time necessary to complete production tasks declined by 85 percent, a remarkable gain in labor productivity. We also present OLS and IV estimates of the effects of using inanimate power, such as steam, at the production operation level Our IV is based on the gerunds describing the various production activities. Treating our IV estimates as causal, about one-third of the higher productivity of machine labor is attributed to greater use of inanimate power per se