http://dealbook.nytimes.com/2011/06/08/is-groupons-business-model-sustainable/ Is Groupon’s Business Model Sustainable?
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http://go-digital.net/blog/2012/04/groupon-settling-into-new-steady-state-lower-users-but-more-usage-per-user/
Groupon userdata
http://www.forbes.com/sites/greatspeculations/2011/11/16/groupons-dilemma-growth-means-burning-cash/ Groupon's Dilemma: Growth Means Burning Cash (expense per new subscriber is increasing)
http://go-digital.net/blog/2012/04/groupon-settling-into-new-steady-state-lower-users-but-more-usage-per-user/
Groupon userdata
http://dealbook.nytimes.com/2011/06/08/is-groupons-business-model-sustainable/ Is Groupon’s Business Model Sustainable?
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http://www.chinaz.com/news/2012/0904/272677.shtml “Groupon需要面对的三个问题”,基本概况了总利润增长和毛利润降低的现状
http://www.forbes.com/sites/petercohan/2012/04/02/should-the-sec-have-stopped-groupons-ipo/ 福布斯分析GROUPON的一篇文章,里面有很多财报数据,很有用。