Why stop there? They haven’t even factored in the cost of developing agriculture from a hunter-gatherer society, or the cost of human evolution or or or
There's inherent baseline - things you've learned and can use culturally at no cost, as you're drawing on _ideas_ - and then there's economic baseline, which is drawn from the larger culture and economy around the commune. Basically, it's not as isolated or insulated as it might purport itself to be.
