10 Brilliant Marketing IdeasFrom radio to YouTube clips, 10 companies that changed everything.
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1. 'A diamond is forever'
Backstory:Diamond prices were sinking fast in 1938, so De Beers mining company enlisted ad agency N.W. Ayer & Son to help reverse the trend. A year later, it launched the "diamond is forever" campaign and brazenly promoted the idea that every marriage required the gift of bling. And plenty of it: It also invented the "two months' salary" spending rule.
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