Digital Dark Matter and the Economic Contribution of Apache
NBER Working Paper No. 19507
---- Acknowledgements ----
We thank Justin Ng for research assistance. We are grateful for the many useful comments we received from audiences at the NBER, Kristina McElheran, Dan Sichel, Ashish Arora, and two anonymous referees. All errors are our responsibility. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.