A few writers argue for shareholder primacy on deontological grounds, i.e., by appealing to rights and duties. On this argument, shareholders own the firm, and hire managers to run it for them on the condition that the firm is managed in their interests. Shareholder primacy is thus based on a promise that managers make to shareholders (Friedman 1970; Hasnas 1998). In response, some argue that shareholders do not own the firm. They own stock, a type of corporate security (Bainbridge 2008; Stout 2