Final answer:
People reach different decisions using cost-benefit analysis because the costs and benefits are subjective, as they include more than just financial aspects, but also time and effort, known as transaction costs. This subjectivity affects the cost-benefit analyses performed by different individuals, leading to various decisions.
Step-by-step explanation:
People reach different decisions using cost-benefit analysis even under the same conditions because costs and benefits are both subjective (option b). This subjectivity is evident in everyday life, such as when voters go to the polls or when individuals make daily purchasing decisions. Different stakeholders, such as renters, homeowners, and business owners, will have varying perspectives on what constitutes a cost or a benefit, influencing their decisions markedly.
The process of cost-benefit analysis involves weighing marginal costs against marginal benefits and is depicted through a T-shaped chart showing costs on one side and benefits on the other. However, the economic approach to decision-making often doesn't match the complex realities of individual behavior and societal operations, which are rarely as orderly as the models suggest.
Further, costs are not merely financial; they include the use of any resources, such as time and effort, which are referred to as transaction costs. Due to the varied perceptions and values of individuals, as well as the diverse nature of costs beyond just monetary ones, cost-benefit analyses by different people can lead to different outcomes even with the same set of facts.