Over the last two decades, work on the Post Keynesian theory of endogenous money has been flourishing, and has prompted a rethinking of the complex nature of money in modern economies. At the heart of the debate between what have now been labelled the accommodationist (or horizontalist) approach and the structuralist approach to endogenous money are the issues of the slope of the supply curves of reserves and of credit money, respectively. Using the distinction between a single period analysis and a continuation analysis, similarities and differences between those approaches are explained, and the suggestion is then made for retaining and re-interpreting them into a more general theory.