This thesis considers the demand for money under conditions of high inflation in Turkey during the period 1986; 1-1995:3. We test whether the monetary and inflationary experiences of Turkey can be adequately characterized by the Cagan (1956) model, using an econometric procedure which is reliant only on the assumption that forecasting errors are stationary. We also examine the hypothesis that monetary policy was conducted in such a way as to maximize the inflation tax revenue. Finally we test the Cagan model with the additional assumption of rational expectations for Turkey for the considered period.