>This is empirically false, there are many ways a large business can lock down a market/resource, or very nearly so, and prevent competition from smaller upstarts. Look no further than two-billion-dollar-a-day-revenue Walmart, whose signature practice is running competitors out of town by undercutting them and sustaining the losses until they close.

A better way to word this is this: consumers chose Walmart over its competitors because they believe they get better deals there than the alternatives.