Arguably, one of the most important developments in the field of applied economics during the last decades has been the emergence of systematic policy evaluation, with its distinct focus on the establishment of causality.By contrast to the natural sciences, the objects of our scientific interest...

The aviation industry changed dramatically in the wake of the Airline Deregulation Act of 1978. My paper looks at an element of this transformation - the policy according to which take off and landing slots were allocated at congested airports including a proposal to change this policy - an...