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This paper investigates the substitutability between money and near-money assets during the period 1976 to 1996 in Switzerland. Financial developments have made a variety of instruments available to store wealth and conduct economic transactions. These developments have generated a "near money " component in households ' and businesses ' portfolio balances. It is important to evaluate the effect of "near-money " on money demand and the effectiveness of monetary policy. Towards this goal, five monetary assets: currency and demand deposits at commercial banks, demand deposits with the postal system, depOSits on transaction accounts with banks, savings depOSits and time deposits are considered. We evaluate the degree of substitutability among these assets using the Morishima elasiticity. Results show that various monetary assets substitute for one another. Consistent with a high degree of diversification, the Morishima elasticity is significantly larger when adjustment takes place in the price of a relatively broader monetary asset as compared with a narrower one. Targeting a broad monetary aggregate captures a variety of assets that contribute to liquidity and aggregat