Given Groupon's published payment terms, this article is a little odd: http://www.groupon.com/pages/merchant-terms-of-service-1 (see 4.3). It seems they're paying merchants only after coupons have been redeemed. So in reality, merchants get their cash later than for regular purchases. Of course these default payment terms can be overridden in a custom agreement, but I wonder how often this really happens?
If they did, Groupon would actually not be in business right now. The amount it owes vendors exceeds its cash, but by the time it has to pay it has sold more Groupons. In other words, Groupon pays old liabilities with new ones (this is, obviously, a point of intense controversy).
http://www.businessinsider.com/groupon-low-on-cash-2011-8?op...
"...it collects cash from Groupons the moment it sells them and doesn't have to pay some of the cash to merchants until 60 days later..."