This book reconsiders Keynes's The General Theory of Employment, Interest and Money and establishes a new interpretation. In contrast to the existing models, this book finds that the stickiness in the nominal wage is not crucial for his theory. Moreover, the author has also succeeds in capturing the concept of liquidity in a rigorous mathematical model. In conjunction with the development of the concept of liquidity, the separation of the decision between savings and capital investment, which plays a key role in the principle of effective demand and denies Say's law, is exactly and...