This book deals mainly with what can be described as the general-equilibrium approach to monetary theory. The author does not attempt an encyclopaedic treatment, rather Gale investigates the central problems and ideas in the development of topical monetary theory. The first part of the book - technically the easier - deals with questions which will be recognized as falling within the traditional field of (macroeconomic) monetary theory, although the treatment is unflaggingly microeconomic. The second part is less conventional, dealing with the general equilibrium theory of money in a fundamental way.