I'm hoping it was freakonomics but here is the basic theory. They said nothing drastically changes in sports with players, it doesn't matter where they play the players play the same. It gave stats in many sports to support this theory like free throw percentage, field goal kickers percentage, strike outs, batting, all sorts of things that you can track home or away in all sorts of sports. So the do entary or website determined the only thing different in wins and losses were the refs. They think the refs don't want to be boo'd or hurt and in soccer they found the home/away difference the biggest in all sports. Giving the rep the fans have over seas, I bought that theory. They gave a much better explanation then I just did. If I find the do entary or a link to the site I will forward to you. God bless