In this paper, we discuss the concept of risk in customer relationships and derive simple metrics that allow for a customer segmentation which focuses on the dynamics of the customer lifecycle. We propose that a customer's trend in revenues as well as her temporal inactivity over time adequately...

This paper deals with three aspects of spectacular oil price episodes such as the one witnessed in 2008. First, the concept of temporary explosiveness is proposed as an empirical method for capturing this type of behavior. The application of a recently proposed recursive unit root test shows...