Before money was invented, how were goods and services exchanged?

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.

i don't know why don't you google it?