![]() ![]() ![]() The test exploits a trigonometric relationship in the isoquant construct, which allows statistical differences in shadow prices to be tested using input and output variables in ratio form. The analysis introduces a novel statistical test based on group differences in the shadow price estimated using fronter efficiency techniques. StoNED is a new unifying framework which fully integrates axiomatic (DEA) and stochastic (SFA) productivity analysis techniques. The study estimates shadow prices using Stochastic Nonparametric Envelopment of Data (StoNED). Furthermore, the investigation assesses the opportunity cost implications of supervising a cohort of banks at the supranational level. The study seeks to understand the impact on loan book growth when reducing non-performing loans. This impact will be especially challenging for bank supervised at the supranational level, and the current two-tier supervisory system may be curtailing sustainable asset growth.Ībstract = "This paper reveals the unforeseen or opportunity cost of tackling asset quality in European banking using shadow prices from efficiency analysis. Our findings suggest that tackling asset quality may have a significant impact of loan book yield and thus the growth of the high-quality loan books at European. For example, in 2016, the annual loss on yield from high-quality loans is 50 basis points higher for bank supervised at the supranational level. Our novel test shows that these cohort differences are statistically significant for all years in our 2010-2016 sample. Furthermore, banks supervised at the supranational level experience a significantly higher shadow price than their nationally supervised counterparts. In 2010, a typical bank experienced a 24 basis point yield loss per €1M reduction in non-performing loans, with this value increasing three-fold to 69 basis points by 2016. The results reveal that the cost of tackling asset quality is economically meaningful and raising. Importantly, the test is independent of the estimation of the frontier and thus free from bias introduced by group differences. This paper reveals the unforeseen or opportunity cost of tackling asset quality in European banking using shadow prices from efficiency analysis. ![]()
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