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Furthermore, members of eBay's rewards program will earn 5% of each Groupon purchase amount in eBay Bucks, which members can use to buy other things on eBay.
The deal makes sense for both companies. Groupon will gain additional exposure, and in exchange eBay will get opportunities to give its users more incentives to buy things in eBay auctions. It's a win-win for consumers too, as long as they don't mind having Groupon deals pitched to them when they visit eBay.