This book is the result of rigorous critical research which reconstructs the spectrum of discussion surrounding Keynes’ main work. The book begins by describing the historical background and the state of the pre-Keynesian economic theory, subsequently immersing the reader in a concise but detailed—as well as innovative— interpretation of the original text. The revision of some of the main interpretative currents prepares the field for the book’s ultimate contribution: the identification of the fundamentals that sustain the analytical structure of . At the same time, this exploration of the theoretical fundamentals of makes this book an original intervention on the genesis and relevance of the divide between micro and macroeconomics—a division that has been fully accepted by contemporary macro theorists.