Back to the razors...
The Gillette Mach 3 is often used a business case in b-schools.
Quote:
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In 1998, after more than $750 million of research and testing, Gillette introduced Mach3, the world's first triple-blade razor. It spent $300 million in the first year to promote it.
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http://www.boston.com/business/globe...azors/?mode=PF