Earlier quoted context omitted.
The thing that protects them is limited liability, as it does many corporations. They can only lose everything the company has, and not more. If you, random HNer, have some holdings of this railroad in your stock portfolio, they cannot come after you for millions. Thus stock ownership is safe for non-billionaires. Bankruptcy, rather — the serious kind — erases all ownership, sells the company off to new owners, and p…
The thing that really protects them is refusal to use anti-trust law to break these large uncompetetive monopolies up. A signal is when these companies begin to engage in massive stock repurchase programs.
The good argument against buybacks is that companies tend to do it when the stock is high, and that’s bad for the shareholders.