Sub-Saharan African countries are facing an unprecedented health and economic crisis that is likely to severely hurt credit quality and raise non-performing loans from already high levels. Banks have a critical role to play not only during the crisis by providing temporarily relief to businesses...

The stochastic frontier analysis (Aigner et al., 1977, Meeusen and van de Broeck, 1977) is widely used to estimate individual efficiency scores. The basic idea lies in the introduction of an additive error term consisting of a noise and an inefficiency term. Most often the assumption of a...