Why do people demand money? Explain the classical and Keynesian views

The only motive classical economists see for anyone demanding money is to transact day-to-day purchases.
This is the transactions demand for money. Keynesians, however, believe that there are two additional
important motives for holding money: the precautionary motive (when people hold money as insurance
against unexpected needs) and the speculative motive (when people hold money when interest rates are low in order to be in a better position to take advantage of future increases in the interest rate).