The fact that this paper is behind a pay wall prompted me ask the following quesion.
I often see this at 'pay walls' for research papers:-
Information about Free Papers
You should expect a free download if you are a subscriber, a corporate associate of the NBER, a journalist, an employee of the U.S. federal government with a ".GOV" domain name, or a resident of nearly any developing country or transition economy.
We have a collection or highly gifted people on this site, some of whom are no doubt very well positioned in US society. Why can a federal employee access this but not a US tax paying US resident?
What is the rational behind this?
This question does have relevance to GT education because I find a lot of useful research papers just out of reach due to pay walls with the above blurb.