Post Keynesian theories of the firm : Kalecki and radical uncertainty This book revisits Kaleckis theory of the firm to show that it constitutes fertile theoretical ground on which to systematically understand the resultant indeterminacy when firms operate under conditions of radical uncertainty. Within Post Keynesian economics there is a spectrum of approaches to theories of the firm but what they have in common is a proper integration of the concept of radical uncertainty: data that cannot be known. The author proposes a way of generalising radical uncertainty by integrating some of the separate approaches within Post Keynesian economics centred around Kaleckis work. Through this it is shown that radical uncertainty does more than just change the ultimate motivation of firms (dropping short run profit maximisation; more complex motivation; interconnectivity with the environment) it is central to the emergence existence and motivation of firms and critically also firm strategy. It is argued that firms do not simply respond to uncertainty; it is the systematic cause of their intentional behaviour. Through developing these arguments the book also contributes to the methodology of Kalecki and Shackle as well as Kaleckian price theory. This book will be important reading for anyone interested in theories of the firm Post Keynesian economics and heterodox approaches to economics more broadly.