This book documents the residual effects of monetarism which now form a part of the mainstream of economics. David Laidler conducts an investigation of the importance of the demand for money, particularly in the light of interest rates and income levels. He has also honed his treatment of the fixed-price IS-LM model, presenting it as a prelude to developing the demand side of an aggregate demand-and-supply framework, and expanded the discussions of data and econometrics. The text encourages students to question the robustness of our knowledge about the monetary sector, promoting further excursions in search of first-hand experience.