Merchants and customers bartered, is the right answer.
Explanation:
In business, barter is an exchange system where members in a purchase undeviatingly exchange products or services for other products or services without employing a medium of exchange, for instance, money. Barter generally befell on the basis of bilateral but it may be multilateral. Market participants practice barter as a replacement for cash as the method of exchange in terms of financial emergencies, in times when currency becomes fissionable.
