Ripple effects from Wal-Mart's used game play

|By:, SA News Editor

Shares of GameStop (GME) drop in early trading after Wal-Mart announces it will launch a used video game exchange program.

GameStop's used game business is vital to the company as it generates higher margins than the new game model. That could get trickier with the retail beast from Bentonville in the mix.

GME -5.5% premarket

Shares of Best Buy (BBY) are down 0.6% as the company also has a little skin in the used game market.