What is possible and why? What is the difference between the merely possible and the actual? In Kant's Modal Metaphysics Nicholas Stang examines Kant's lifelong engagement with these questions and their role in his philosophical development. This is the first book to trace Kant's theory of possibility all the way from the so-called 'pre-Critical' writings of the 1750s and 1760s to the Critical system of philosophy inaugurated by the Critique of Pure Reason in 1781. Stang argues that the key to understanding both the change and the continuity between Kant's pre Critical and...