An occasional feature highlighting websites intended to expand our thinking. By the way, they may or may not be aligned with our personal opinions here at Nip Impressions. Sites posted here can also be found permanently residing in the "Collabtools--Web Links" Section of the Cellulose Community. Join the Cellulose Community at http://www.cellulosecommunity.net. A preeminent measure of international purchasing power parity - The Big Mac Index. http://www.economist.com/markets/Bigmac/Index.cfm You can also reach it by clicking on "More" below.