1. Patrick Bajari is Vice President, Amazon, Seattle, WA 98109, USA
2. Brian Burdick was Director of Research at Core-AI at Amazon while doing this work
3. Guido W. Imbens is Professor of Economics, Graduate School of Business and Department of Economics, Stanford University, SIEPR, NBER, Stanford, California 94305, USA
4. Lorenzo Masoero is Research Scientist, Amazon, Seattle, WA 98109, USA
5. James McQueen is Principal Scientist, Amazon, Seattle, WA 98109, USA
6. Thomas S. Richardson is Professor of Statistics, University of Washington, Seattle, WA 98195, USA
7. Ido M. Rosen is Sr Principal Scientist, Core AI, Amazon, Seattle, WA 98109, USA