Walmart was once a small regional player, too.Consumer staples retail may seem like an unexciting business. Still, certain superior retail business models have gone on to generate massive market returns. Such was the case with Walmart (WMT -1.20%), which went on to become a 100-bagger stock over a 40-year period between 1972 and 2012.These stocks look inevitable in retrospect, but who would have thought that a low-margin general store started in rural Arkansas would go on to become the international juggern ...