Title: Identification of Intertemporal Preferences From Choice Set Variation

Abstract: The paper provides conditions to identify the discount factor(s) and utility function in an infinite-horizon dynamic discrete choice model variation in choice sets over time. We show that if current choices or states are informative about the choice set the agent will face in the future, then the discount factor and utility are identified without any strong normalization. These identification results hold in both the exponential discounting model and, if the choice set provides a form of pre-commitment, the quasi-hyperbolic discounting model. Identifying the discount factor and utility allows us to identify the counterfactual policies which often are the objects of interest in dynamic discrete-choice analysis, but which are not generally identified. We conduct a data analyses to validate our approach.