It really doesn't matter if the study is real or not. What it suggests is or would happen is spot on.
I know that if going to work every day began to net me less and less pay to spend on things that I enjoy and want, but don't need, to give more to those that don't go do the same I'd quickly give up and revert back to the 2 year old "uhh uhh gimme gimme" mentality. If you can't say you'd do the same you are either a hell of a better humanitarian than I am or completely full of bullshit.
I finally finished up my taxes last night and as I did I was infuriated when I saw the big red number up in the corner. Not because I owed money, but because I know there are worthless pieces of shit out there that, as I remember someone mentioning on here, are getting back MORE than they even paid in.