You're saying that we shouldn't stop Walmart monopolies because it would stifle competition?

The proof is in the fact that Walmart has came to many smaller towns and wiped out local competition due to size and economy of scale. The only companies that can compete is ones at similar scale while local businesses go bankrupt and money is drained out of the community.

When did free market economics turn into support for massive monopolies and allowing single corporations to control entire markets?