[marcosdumay]

> I don't know how you can prove the existence of voluntary exchange in the real world.

You mean that in a "what is free will anyway" form? Or is there something definable that you contest?

> The "obvious" conclusions you can derive from a continuous neoclassical model make no sense the moment you add multiple goods because at that point you now need to run NP hard optimization algorithms to get an equivalent answer.

I don't think many economists would disagree with that equivalence. They seem to always hint very strongly at it, but never actually articulate it. Exactly why do you think it's a problem?

Overall, I have some strong criticism of modern economics. You seem to be bothered by the same kind of thing, but I can only sympathize with your complaint about continuous models.