This is why your mold example shows the opposite of what you pointed out. They optimize for them only. There is less freedom coming from the ones that ‘are our betters’ unless government intervenes (not all the time, but enough to prevent monopolies or duopolies), as it is clear that the ones controlling the market do optimize things for their own benefit, then they do not have an incentive to do the right thing.
Yet another “Susanita” argument, in this case it is a willful omission of the point being made, assuming for a moment that yes, Wallwart saves a lot of money for poor people, that should not be a reason to look away from the corruption being reported. The corruption that was pointed out when Charmin does that with the shelf space, while the store may lower prices, the point is that lack of competition eventually does keep prices up. Point being that the prices then would be even lower if there were better chances given to the competitors of Charmin.