A Little Matching Never Hurt Anyone (Maybe)

Even though most of you may never use matching, that doesn't mean it's not fun to learn it.

Introduction

The only estimation procedure I can think of with a worse reputation among empirical economists than instrumental variables is matching. It isn’t matching itself that is to blame so much as it is the class of methods using conditional independence but still, the apple does not fall too far from the tree. And it does make sense that the two —…