Acknowledgements

This is a work in progress. In fact, it is partly your work in progress, as I will be listening for your constructive comments along the way. You should expect that refinements and corrections will occur over the course of our ten weeks. In that knowledge, please do not hesitate to voice any relevant thoughts you might have.

There are many in the profession who are owed our thanks for public-good contributions that make others’ classes stronger. Special thanks go to Joshua Angrist, David Autor, Badi Baltagi, Colin Cameron, Scott Cunningham, Sue Dynarski, Grant McDermott, Austin Nichols, Ed Rubin, Yuki Yanai, and Jeff Smith. Any and all errors are my responsibility.