Concept: Households are consuming units that aim to obtain the greatest possible satisfaction from their limited resources.Explanation: Households take part in the economy as consumers and as owners of factors of production. They face scarcity because their wants are unlimited while their resources are limited. As a result, they cannot satisfy every desire. Economic decisions involve choosing how to allocate scarce resources among competing alternatives. Households make these choices in order to achieve the highest possible level of utility, or satisfaction, from the goods and services they consume. Maximizing satisfaction is the main reason behind their spending, saving, and work decisions. Profit maximization applies mainly to firms, not households. Increases in salaries and purchases are possible outcomes but not the fundamental aim of household decisions.Answer: D. maximize their satisfaction