Turns out this is a difficult problem with no one good solution. Subjecting labor to a race to the bottom is probably the most efficient individual system from a capitalist standpoint, but it destroys itself just as much as your customers can no longer afford to buy most of the products made. The selfish strategy ruins the entire system if everybody does it.

Capitalism and Communism have opposite problems. Communism attempts to manage the markets from a top down approach, making it relatively easy to handle systemic problems but almost impossible to optimize for efficiency because there is far too much information that doesn't make it to the top. Capitalism by contrast pushes the decisions down to where the information is, allowing for excellent efficiency but leaving it blind to systemic problems.

So the best solution is some kind of meet in the middle approach that is complex and ugly and fosters continual arguments over where lines should be drawn.