http://www.businessinsider.com/why-diamonds-are-a-sham-2013-3
This article explains how the fact that everyone today buys diamond rings for their engagement is the result of one incredibly successful ad campaign by De Beers in 1938. If you consider the imprint global demand for diamonds has left on post-colonial Africa (Sierra Leone is the most famous case), a re-evaluation of the role ad agencies play in global politics might be in order. Interesting stuff.
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