In the Angela-Bruno model, Bruno's well-being is determined solely by the amount of grain he receives as a landowner. He is indifferent to Angela's amount of free time or how many hours she works, as these do not directly affect his utility. His primary objective is to maximize his share of the grain. This specific preference structure means his indifference curves, when plotted on a graph of Angela's free time versus grain, are represented as horizontal lines, as illustrated in Figure 5.3c.