Or how about a free product once you buy 9 of similar value? Punch cards are the... | Hacker News

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lxm on Feb 21, 2013 | parent | context | favorite | on: LivingSocial: Employees' and Founders' Common Stoc...

Or how about a free product once you buy 9 of similar value?

Punch cards are the original loyalty program, but I'm not sure how well they work for new customer acquisition.

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