Network Effects and Switching Costs: two short essays for the new New Palgrave Paul Klemperer Edgeworth Professor of Economics, Oxford University, and Member, UK Competition Commission* Abstract We briefly survey the economics of network effects and switching costs (in 3,400 words). For comprehensive coverage of the same ground see Farrell and Klemperer’s 60,000-word contemporaneous survey, available at www.paulklemperer.org