[qup]

Why would we think businesses will always make the right move?

They'll blunder. They'll do it even harder in the absence of competition.

[delecti]

Who said I thought businesses would always make the right move?

Businesses blunder. "The market" is just a set of observations, including that competitors will tend to take advantage of those blunders. It is not a failure of the market that businesses have blundered, nor surprising that it will happen occasionally, and neither I nor mrweasel implied otherwise.