This is a classic economics 101 topic (Purchasing Power Parity). Prices should equalize, but can't due to barriers such as customs and immigration laws. Obliga

This is a classic economics 101 topic (Purchasing Power Parity). Prices should equalize, but can't due to barriers such as customs and immigration laws. Obligatory Big Mac index link: http://www.economist.com/content/big-mac-index http://www.economist.com/content/big-mac-index