Economists have studied for a long time how decision-makers allocate scarce resources. The recent literature on rational inattention studies how decision-makers allocate the scarce resource attention. The idea is that decision-makers have a limited amount of attention and have to decide how to...

A researcher is interested in a set of variables that he wants to model with a vector auto-regression and he has a dataset with more variables. Which variables from the dataset to include in the VAR, in addition to the variables of interest? This question arises in many applications of VARs, in...