The visible hand in economics

Patents not so evil after all…

Posted on: November 13, 2007

We’ve previously blogged about the potential for patent protections to restrict innovation when inventions are sequential. However, Sudipto Bhattacharya and Sergei Guriev suggest on VoxEU that the research we cited by Bessen and Maskin might be misleading. In particular they point out that there is a ‘third way’ that knowledge can be treated.

Rather than patent it or make it public, a firm may choose to simply keep the information private as a trade secret. It can then be licenced to a vendor in return for royalties. Unfortunately, this is less efficient than patents because the vendor will under-invest in development of the technology. Essentially this is because the vendor bears the whole cost of further development but is forced to pay a portion of the revenue generated from that investment to the original inventor in the form of royalties. The authors claim that decreasing patent protections could thus cause more inventions to be kept secret and inefficiently licenced, which reduces total welfare.

As a consequence is that the number of ideas available to firms to develop is probably a concave function of the level of patent protection, with an interior maximum! With no patent protections ideas are kept as trade secrets and handed out under exclusive licences. With full patent protection it is too costly to licence the patent and develop the idea. In both cases the level of innovation will be low. Somewhere in between is the ideal level of intellectual property rights enforcement. So even if innovation is sequential, reducing patent protections has the potential to stifle further invention, although not for the reasons usually cited.

NB. Besson and Maskin’s paper isn’t directly comparable with the Vox paper: the former use complementarities to drive their result while the latter exclude such complementarities and allow for private information. Bhattacharya and Guriev are therefore considering a more general problem than B & M, which is why I describe reliance on the B & M result as misleading: it doesn’t represent the vast majority of industries in which patents are used.

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