http://www.economist.com/node/11784836http://www.economist.com/node/11793125
http://en.wikipedia.org/wiki/List_of_unusual_units_of_measurement#Length
http://www.up2maps.net/maps/marco%20polo/World/big_mac_index.html
http://www.economist.com/markets/Bigmac/Index.cfm
http://econblog.aplia.com/2006/06/itunes-index-for-exchange-rates_16.html
http://en.wikipedia.org/wiki/Golden_Arches#The_Golden_Arches_theory
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