A landowner is negotiating a rental contract with a tenant farmer. The 'feasible frontier' represents the total harvest possible for a given number of hours the tenant works. The landowner's income is the total harvest minus the tenant's share. The tenant proposes an allocation, Point R, as an alternative to the landowner's initial offer, Point N. Why would a rational landowner be indifferent between accepting Point R and Point N, even if the total harvest and the tenant's work hours are differe