Many online retailers have enjoyed the benefit of not having to collect state sales taxes. Compared to brick-and-mortar retailers, it's given them a price advantage to the tune of 5% to 10%. Implementing an online sales tax would level the playing field between online and offline retailers. In this video, Fool contributor Steve Heller weighs in on how adding an online sales tax would help Amazon.com's (NASDAQ:AMZN) logistics and whether it would slow the growing trend of consumers shopping online.