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More specifically, this has to do with the Big Mac Index by The Economist.

http://en.wikipedia.org/wiki/Big_Mac_Index

http://www.economist.com/content/big-mac-index

Further to this, the Economist stopped publishing Argentina's consumer price index numbers in from INDEC in Feb 2012 numbers due to government involvement::

http://www.economist.com/node/21548242

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