‘Buying and selling can take place without going to a marketplace.’ Explain this statement with the help of examples.

Buying and selling can take place without going to a marketplace firstly as goods which are ordered over the internet and the amount is paid by credit or debit cards or when the goods are delivered to the customer i.e., cash on delivery. And secondly, goods which are also ordered over the telephone, and the payment is done when goods are delivered to the customer.