In this paper we confront sensitivity analysis with diagnostic testing.Every model is misspecified, but a model is useful if the parameters of interest (the focus) are not sensitive to small perturbations in the underlying assumptions. The study of the e ect of these violations on the focus is...

This paper proposes a standard for notation in econometrics.It presents a fully integrated and internally consistent framework for notation and abbreviations, which is as close as possible to existing common practice and also obeys ISO regulations.The symbols used are instantly recognizable and...

This paper reconsiders the ‘curse of resources’ hypothesis for the case of China, and distinguishes between resource abundance, resource rents, and resource dependence. Resource abundance and resource rents are shown to be approximately equivalent, and their association with resource...

We consider the question whether top tennis players in a top tournament (Wimbledon) employ an optimal (efficient) service strategy. We show that top players do not, in general, follow an optimal strategy, and we provide a lower bound of the inefficiency. The inefficiency regarding winning a...

We discuss how to generalize the concept of vector derivative to matrix derivative, propose two definitions, a 'broad' and a 'narrow' one, compare the two definitions, and argue in favor of the narrow definition.