C. Gustav Helmers

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Patent pools, which allow firms to combine separately owned patents, are expected to strengthen incentives for R&D by reducing litigation risks and license fees. But pools may also weaken incentives by creating high levels of effective concentration in an industry. This paper takes advantage of a window of regulatory tolerance under the New Deal to examine(More)
This paper identifies the effect of neighborhood peer groups on childhood skill acquisition using observational data. We incorporate spatial peer interaction, defined as a child's nearest geographical neighbors, into a production function of child cognitive development in Andhra Pradesh, India. Our peer group construction takes the form of directed(More)
The clinical diagnosis of the type of acute cerebrovascular diseases is often considered unreliable, although this has not been validated prospectively in representative patients. The accuracy of bedside diagnostics was, therefore, tested in 206 patients consecutively admitted to the Stroke Unit of the Serafimerlasarettet in Stockholm. Bedside diagnosis(More)
We survey the economic literature, both theoretical and empirical, on the choice of intellectual property protection by firms. Our focus is on the tradeoffs between using patents and disclosing versus the use of secrecy, although we also look briefly at the use of other means of formal intellectual property protection. Disclaimer: This work contains(More)
This paper explores the characteristics of 238 patents on 90 inventions contributed by major multinational innovators to the " Eco-Patent Commons " , which provides royalty-free access to third parties to patented innovations on green technologies. We compare the pledged patents to other patents in the same technologies or held by the same multinationals to(More)
This study examines the benefits of nonlinear time series modelling to improve forecast accuracy of the El Niño Southern Oscillation (ENSO) phenomenon. The paper adopts a smooth transition autoregressive (STAR) modelling framework to assess the potentially regime-dependent dynamics of sea surface temperature anomaly. The results reveal STAR-type(More)
You may re-use this information (excluding logos) free of charge in any format or medium, under the terms of the Open Government Licence. To view this licence, visit Where we have identified any third party copyright information you will need to obtain permission from the copyright holders concerned. are in applied econometrics with a special focus on(More)
Patent pools, which allow competing firms to combine their patents, have emerged as a prominent tool to resolve crippling risks of litigation when multiple firms own patents for the same technology. This paper takes advantage of a window of regulatory tolerance under the New Deal to investigate the effects of pools that would form in the absence of(More)