A mother needed someone to baby sit her child but had no money. She made a deal with other person who wanted to move into a new house and thus needed assistance in moving things from old house to new house. In the deal, they decided to help out each other. Which kind of system does this refer to?

Currency system Helping system Barter system Trade system

Barter system

Barter is a system of exchange in which participants in a transaction directly exchange goods or services for other goods without using money. Here two people are exchanging services without involvement of money. Hence it indicates a barter situation.