The authors are grateful to the team at HP for the field collaboration. The authors thank Jonathan Levav for thoughtful feedback on several versions of this paper. The authors are grateful to seminar participants at UCSD, UToronto, Stanford, SDSU, NUS, CUHK, UHK, MIT, George Mason, Tel Aviv, York, Ohio State, and UCLA for helpful comments. The authors are grateful to the editor, associate editors, and reviewers for their invaluable input. The authors also thank Ethan Lee and Aarez Brohi for research assistance.