This paper examines empirically the role of bank market power as an internal factor influencing banks' reaction in terms of lending and risk-taking to monetary policy impulses. The analysis is carried out for the US and euro-area banking sectors over the period 1997-2010. Market power is estimated at the bank-year level, using a method that allows the efficient estimation of marginal cost of banks also at the bank-year level. The findings show that banks with even moderate levels of market power are able to buffer the negative impact of a monetary policy change on bank loans and credit risk. This effect is somewhat more pronounced in the euro area compared to the US. However, following the subprime mortgage crisis of 2007, the level of market power needed to shield bank loans and credit risk from the impact of a change in monetary policy increased substantially. This is clear evidence that the financial crisis reinforced the mechanisms of the bank lending and the risk-taking channels.

We develop a framework to incorporate bank risk, as measured from the variance of profits or returns, within a model of frontier efficiency. Our framework follows the premise that risk is endogenously related to efficiency. We estimate our model using panel data for U.S. banks and Bayesian techniques. We show that excluding risk from the efficiency model significantly biases the efficiency estimates and the ranking of banks according to their competitive advantage. We also demonstrate that there is a negative risk-efficiency nexus with causality running both ways, while our estimates of risk are fully consistent with the developments in the banking industry over the period 1976–2014

Using a panel data set of effective tax rates that are directly comparable across Organization for Economic Co-operation and Development (OECD) countries and over time, we investigate the redistributive effect of labour, consumption and capital tax rates. We show that what matters from a redistributive standpoint is the tax mix rather than the tax rates in isolation from the rest. The results suggest that increasing the tax burden on labour or consumption relative to capital leads to higher income inequality. In contrast, greater reliance on labour taxes relative to consumption taxes improves income equality. This effect likely stems from the redistributive objectives of social security contributions incorporated in labour taxes.

This article proposes the estimation of marginal cost of individual firms using semiparametric and nonparametric methods. These methods have a number of appealing features when applied to cost functions. The empirical analysis uses data from a unique sample of the California electricity industry for which we observe the actual marginal cost and estimate the marginal cost from these data. We compare the actual values of marginal cost with the estimates from semiparametric and nonparametric methods, as well as with the estimates obtained through conventional parametric methods. We show that the semiparametric and nonparametric methods produce marginal cost estimates that very closely approximate the actual. In contrast, the results from conventional parametric methods are significantly biased and provide invalid inference.

The paper previously circulated under the title ""What's the Use of Having a Reputation If You Can't Ruin It Every Now and Then?" Regulatory Enforcement Actions on Banks and the Structure of Loan Syndicates". Ongena acknowledges financial support from ERC ADG 2016-GA 740272 lending.