General Introduction.- 1 A Theory of Investment.- 1. 1 Problems in the Neo-classical Theory of Investment.- 1. 2 Firm's Investment Function and Its Demand for Money Function.- 2 Basic Relations of a Neo-Keynesian Theory.- 2. 1 Towards A Neo-Keynesian Theory.- 2. 2 Basic Relationships of A Neo-Keynesian Theory.- 3 A Neo-Keynesian Theory of Growth Cycle.- 3. 1 A Model of Growth Cycle.- 3. 2 Technical Progress, Innovation and Growth Cycles.- 3. 3 Change in Money Supply and the Growth Cycle.- 3. 4 Growth Cycles and Movements of the Rate of Interest.- 4 A Neo-Keynesian Theory of Inflation.- 4. 1 On a Dynamic Analysis of Inflation.- 4. 2 Model of Employment Inflation.- 4. 3 Steady State Employment Inflation.- 4. 4 Stability of the First Phase (Case with ? > 0).- 4. 5 Stability of the First Phase where ? = 0 and Second Phase.- 4. 6 Employment Inflation and Economic Policy..- 5 A Neo-Keynesian Theory of Monetary Growth.- 5. 1 Problems.- 5. 2 Model.- 5. 3 Steady State Economic Growth.- 5. 4 Stability.- 5. 5 Implications of Steady State.