An interesting read on previous attempts at the group-buying idea

Although none of the mentioned companies had the exact same business model as Groupon. Still, it could be an exercise in finding what one could do better in each case :)

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The companies that died so that Groupon could live
Business ideas that are truly unique, innovative, and new are nearly impossible to come up with. So when a company hits it big on an certain concept, it's always interesting to probe …