Mark Stross offers his analysis of the most valuable retailer in the world as of this airing date. With a market cap of $1.7 trillion, the company is expected to account for almost 5% of total retail sales by the end of 2020. A company this big is possible only because of the clever use of technology and digital systems. Is this too big? Or does the speed and accuracy of the digital age welcome in more companies of this size?