Following the seminal work of Mirrlees (REStud, 1971), there has been a large amount of work on how to design an optimal tax system when agents' skills are private information. This literature makes a strong assumption: it assumes that the data generation process for skills in the economy is...

A fundamental non-stationarity of infinitely repeated games as usually studied is that the length of the history of play gets longer each period. With private actions (and mixed strategies) or private signals, this introduces a particular difficulty with common solution concepts such as...