Because a different landlord is happy to only take $400 of it, and another landlord is happy with only an additional $300. In aggregate, you will find some equi

Because a different landlord is happy to only take $400 of it, and another landlord is happy with only an additional $300. In aggregate, you will find some equilibrium under $500. From another perspective, why doesn't food cost 90% of our income anymore? Why didn't food prices go up in perfect lockstep with every productivity improvement and rise in wages since 300BC? Because there are people out there willing and happy to sell it for less, no other reason.