By adjusting lending, banks can smooth the macroeconomic impact of deposit fluctuations. This may, however, lead to extended periods of disproportionately high lending relative to deposit intake and, under certain conditions, to the accumulation of risk in the banking system. Using bank-level data for 8477 banks in 129 countries for the period from 1992 to 2015, we examine how banks' market power and other characteristics may contribute to smoothing or amplification of shocks and the accumulation of risk. We find that the higher their market power the lower is the growth rate of lending relative to deposits. As a result, in periods of falling deposits higher market power for the average bank is associated with a greater fall in lending, consistent with amplification of adverse effects during relatively bad times. Strikingly, at very high levels of market power, there is a threshold past which the effect of market power on the growth rate of lending relative to deposits turns positive so that “superpower” banks may contribute to the smoothing of adverse effects when deposits are falling. In periods of rising deposits, however, such banks are more likely to lead to amplification and accumulation of risk in the economy.

We investigate the effect of regulatory enforcement actions on banks' reputation by estimating the effect of non-compliance with laws and regulations among lead arrangers on the structure of syndicated loans. Consistent with a regulatory reputational stigma, a punished lead arranger increases her loan share to entice participants to continue to co-finance the loan. Consequently, when punished lead arranger initiates a new syndicated loan, then this loan tends to be more concentrated and co-funded by participants with previous collaboration with the lead arranger. However, the observed share increases by punished lead arrangers are seemingly mitigated by extending the loan guarantees, performance pricing provisions, and covenants.