I'm and Economics student, so i'd try and find some data on the number of visitors etc, and see how it has lost out (if it has at all) since DisneyLand has been open. I don't know if that has any relevance to the subject you're doing though...
I actually think that DisneyLand Paris is better in the winter. If you chose your day wisely there souldn't be too many people there, and the decorations are awesome.