A good starting point would be Sir Arnold Plant and his 1934 paper titled, "The Economic Theory Concerning Patents for Inventions," in Selected Economic Essays and Addresses (London: Routledge & Kegan Paul, 1974). Ronald Coase, a student of Plant at the LSE in the early 30s, has written about him in the New Palgrave, and also in "The unfinished agenda" (London, Institute of Economic Affairs, 1986). Carlos Rodr=EDguez Braun