This book examines how the Cambridge School economists, including J. M. Keynes, constructed revolutionary theories and advocated drastic policies based on their ideals for social organizations, as well as their personal characteristics. Although vast numbers of studies on Marshall, Keynes and Marshallians have been published, unexpectedly, there have been very few studies on the `Keynesian Revolution¿ or Keynes¿s relevance to the modern world from archival and intellectual viewpoints focusing on Keynes as a member of the Cambridge School. This book approaches Keynes from three directions: persons, times and perspectives.