Amazon's (AMZN -1.65%) march toward retail dominance seems to continue with the addition of same-day delivery to its suite of offerings. The double-edged sword of faster delivery also means increased collection of state taxes, a specter Amazon has avoided like the plague. But the gains to be had from same-day delivery could outweigh the drag that additional tax collection creates if executed well. Reports of Amazon's special delivery lockers in locations across New York City could be the key to the project's success. Sky-high valuations increase the risk of undertaking such an expensive expansion, though, and missteps could ripple through the share price.

Amazon's impressive execution thus far earned it one of two positions as a recommendation of our analysts' report "The Death of Wal-Mart: The Real Cash Kings Changing the Face of Retail." In it, you'll see how these two cash kings are able to consistently outperform and how they’re planning to ride the waves of retail's changing tide. I invite you to uncover the other pick by clicking here.