True bartering is actually sharing. The Exchange is natural and only observable by the final product because of the small moving parts it is almost impossible to see locally. By naturally acting you're contributing to society. No matter whether you are standing still or moving. If you help a child across the street for a moment you were a crossing guard by doing what came naturally you Bartered. If you attempt to assign a value to it you turn a Priceless action into one that devalues the entire human race.