tion-based partner choice promotes cooperation in social networks. Phys Rev E 78: 026117. appears in Vir J Bio Phys Res 16(5). 205. Goldstein R, J Almenbcrg, A Dreber, JW Emerson, A Herschkowitsch, J Katz (2008). Do more expensive wines taste better? Evidence from a large sample of blind tastings. J Wine