Answer:
Hello!
Your answer would be "trading goods or server for other goods or services"
Bartering means that instead of using any form of money to pay for a service, you give them a service in return.
For example, If someone wanted their trees trimmed, they could pay by walking the person who would trim the tree's dog for a week.
That would be exchanging a service for a service
Hope this helps!
Have a great day!