Does Europe offer lessons for the consolidation in US banking? In this paper, it is argued that the political dimension in Europe has led to the protection of national flagships and consolidation mainly on a national scale. Lessons for the US are limited. Rather, the regional expansion observed in US banking may offer valuable lessons for imminent cross-border mergers in European banking.

We point to the vast empirical literature in banking to argue that the current expansion of scale and scope in banking represents a puzzle. We then present two explanations that help us to understand why banks are getting bigger and doing more. Our explanations suggest that banks may be doing this to increase their shareholders' wealth and/or merely to enhance the reputation of their management (CEOs). The latter could lead to herd behavior involving banks that increase size and scope despite a dissipation of shareholders' wealth. Alternatively, increasing size and scope may offer strategic benefits (and hence increase shareholder wealth) in an environment with sufficient profitability in current operations and substantial uncertainty about future core competencies. We explore conditions under which either one of these competing explanations may dominate.