For academics, regulators and policymakers alike, it is crucial to measure financial sector competition by means of reliable, well-established methods. However, this is easier said than done. This comprehensive Handbook provides a collection of state-of-the-art chapters to address this issue. Using the latest empirical results from around the world, expert contributors offer a thorough assessment of the quality and reliability of the prevalent measures of competition in banking and finance. The Handbook consists of four parts, the first of which discusses the characteristics of various measures of financial sector competition. The second part includes several empirical studies on the level of, and trends in, competition across countries. The third part deals with the spillovers of market power to other sectors and the economy as a whole. Finally, the fourth part considers competition in banking submarkets and subsectors. This Handbook is an essential resource for students and researchers interested in competition, regulation, banking and finance. Politicians, policymakers and regulators will also benefit from the thorough explanation of the need for anti-trust regulation and identification of the most reliable competition measures.Contributors include: A.N. Berger, J.A. Bikker, W. Bolt, J. Bos, Y.L. Chan, P. Coccorese, M.D. Delis, J. Fernández de Guevara, Z. Fungácová, R. Gropp, I. Hasan, J.P. Hughes, D. Humphrey, L.F. Klapper, S. Kleimeier, C. Kok, S. Kokas, J.W. Kolari, M. Lamers, L. Liu, J. Maudos, L.J. Mester, C.-G. Moon, N. Mylonidis, S. Ongena, B. Overvest, V. Purice, R.J. Rosen, H. Sander, S. Shaffer, L. Spierdijk, D. Titotto, R. Turk-Ariss, G.F. Udell, L. Weill, J. Yuan, M. Zaouras