Groupon (NASDAQ:GRPN) shares were up more than 13% Wednesday morning, thanks to its launch of a new mobile payment system in the U.S.

This should prove attractive to businesses, as Groupon will pocket a lower transaction fee than eBay's (NASDAQ:EBAY) PayPal.

It's still too early to tell if this will upend the likes of PayPal, Square, and other mobile payment systems, but it's a much-needed expansion to Groupon's business model.

 

Watch the video segment below for the MarketFoolery team's insights on this potential game changer for Groupon. And if you're looking for something different, then you should check out our new free report, The Motley Fool's Top Stock for 2012. In it, our chief investment officer identifies his favorite company for the year. To access the report before the rest of the market catches on, click here -- it's absolutely free.