Yes, I mean that B could charge a lower price, and 'capitalist reason' would dictate buying the apple from B. I'd urge you not to conflate externalities with future value; there are many reasons one producer could have a higher future value than another, and they aren't all socially beneficial. For instance, farmer B might be an excellent and responsible farmer who's about to retire. Or maybe farmer A uses slave labor and is smart enough to never get caught.

Re: static rent, I meant in your code, not in the idea of hypercapitalism; each node is given pER at the beginning and it doesn't change. Having some kind of time-varying pER that buyers can predict, together with having higher pER nodes charge lower prices, would start to get at the difference between capitalist and hypercapitalist reason, but that starts to get complicated, and I'd have to think a while longer to conclude that it doesn't need even more complexity to make sense. (I've had other thoughts on how to improve your code, but they keep exploding into endless chains of 'but if you add this, then you have to add that')

And when I questioned if future-value-based buying was 'desirable', I meant for society. Take the example of the retiring farmer; 'capitalist reason' would say to buy from them iff they sell the best-priced apple, whereas hypercapitalist reason would penalize them for their lack of future value.

Also, random thought: it'd be cool to add utility measures. I'd suggest utility per node per month as log(spending/necessities).