I think I'd disagree on the point about land. Suppose actor A has no land and $1000 in cash, and actor B has $500 worth of land and $500 in cash. B is willing

I think I'd disagree on the point about land. Suppose actor A has no land and $1000 in cash, and actor B has $500 worth of land and $500 in cash. B is willing to sell A his land for $500. A agrees and they engage in the transaction. After the transaction, A lost $500, but gained $500 worth of land so A still has $1000 of property. B lost $500 worth of land, but gained $500 in cash. So before the transaction, each has $1000 of property (cash + land), and after the transaction, each still has $1000 worth of property (cash + land). It's just been shuffled a bit based on what each actor desired and what they were willing to pay for what they wanted. In general, LOTS of transactions in the real world work this way, i.e., actors engage in the transaction to result in a net increase (perceived) of value to themselves. So the simulation is unrealistic in that respect: it assumes transactions in which one party loses are just as likely (if not more likely) than those in which the transaction only occurs if both parties win. In the real world, most transactions occur only if both parties feel the trade is a fair exchange of value (no net loss to either side).