The best way to generate value will be if you both get done for illegal trading of services without training licenses and generate a few hundred thousand to a million in GDP via the legal fees, plus remediation though approved service providers.

Now you're thinking with Line Go Up!

Not really IMHO. It only would if those goods get traded later on. One could probably even argue that it destroys value, as the labor is not bought on the market.

Right. People are mistaking the map for the territory. Barter absolutely is part of the economy, and benefits the traders to the same degree a monetary transaction would; it just isn't included in most economic measures, because they're imperfect.