Answer:
They type of system used in this transaction is Barter System.
Step-by-step explanation:
Barter sysem is an exchange or a trade of goods or services, in which two persons benefit each one of the transaction. This system was used in past civilizations when money wasn´t yet the current medium of exchange.
In this case Buddy helps cleaning the gutters in exchange of a wreath to hang on his door, and so one thing for another, works as a transaction that does not involve money.