Explain how citizens can impact government through civic participation.

Barter system

Explanation:

In the ancient world when money or currency was not invented, people used to exchange goods and services in return of some other goods or services of their choice.

This is one of the old method of exchange. It is one of the old century method  and is used by people when no coins or money was there. It is that characteristics of the economy where people rely on others for goods and services.