Do you have skills or unused items that might be useful to others?
Perhaps you know how to can and have all the supplies, but no veggies.
Someone without the skills and jars might be willing to share their harvest.
Perhaps you know how to use a word processor but are clueless about car mechanics.
Maybe a mechanic needs secretarial work or advertisement fliers put together.
Maybe you are not able to cut your grass or rake your leaves but can do laundry or cook for someone that can.
Perhaps you have an old boat but need a table saw or other tools.
Barter for the benefit of all.