The Modigliani and Miller (MM) propositions provide a foundation for corporate finance theory. Nevertheless, this paper argues that their adoption has led to a disengagement of such theory from the humanity of business, as well as, more broadly, from concepts of corporate strategic management. As a result, the context within which textbooks allow corporate investment and financial decisions to take place is severely distorted from reality. The paper argues that we require the context of behavioural and strategic corporate management if we are to accommodate the reality of business, the behaviour of formalised groups, and an ethical dimension to business. This paper argues that the focus on the Modigliani and Miller (MM) propositions as the foundation of corporate management has led to a stylized representation of corporate financial decision making that is far removed from reality. Specifically, it has brought about a disengagement from the behavioural and corporate strategic contexts within which corporate financial decision making actually functions.It is not, I note, a case of whether the MM propositions are 'right' or 'wrong'. It is, for example, possible to build a working model of the solar system with the Earth at the centre (such a model existed at the time of Copernicus) but this model has distorted what is actually central and therefore cannot be extended to understanding the universe outside the solar system. The model is more or less exhausted. Similarly, with MM theory, the problem is that experiences are not actually illuminated by the model's core assumptions, but by postulating contradictions to those assumptions. The model 'can go no further'. The broader galaxy of strategic corporate management, the elements of reputation and trust underlying corporate and financial activity, and recognition of an ethical dimension to behaviour are outside its domain.