No one, not even Amazon, reached the "only show in town" scale. Walmart's online presence for most popular items is competitive and many times offer lower price

No one, not even Amazon, reached the "only show in town" scale. Walmart's online presence for most popular items is competitive and many times offer lower prices. Uber, Airbnb, and other companies in this space are valued based on the assumption that they will in fact be able to reach that scale. And if they do, no doubt many of these unicorns will well exceed the trillion dollar market cap