Introduction of money has separated the acts of 'sale' and ' purchase ' . How? ( if possible give answer in points )

Earlier, in barter system, if a person intended to buy a particular commodity, he had to sell another commodity available to him as a price. This is because any common medium of exchange was not present and this led to the exchange of commodities for commodities. Hence, purchase and sale were bound to be made at the same time in case of any transaction.

Introduction of money allowed individuals to separate their acts of 'sale' and 'purchase'. After the money was introduced as common medium of exchange, a person could buy a particular commodity without selling any other commodity available to him. This is because he could use money to buy the commodity.