Citizen Preferences and BCA: A Model of Willingness-to-Pay behind a Veil of Ignorance

Public sector allocative decisions should reflect, as far as possible, the preferences of those affected by the decisions. Conventional benefit-cost analysis (BCA) will simply aggregate individuals' private willingness-to-pay (WTP) over all affected individuals to estimate the total benefits of a policy that delivers a public good. Given the nature of a public good, it is not unreasonable to consider that an individual may have altruistic preferences over the consumption of the public good by others. In this paper, we set out the theoretical underpinnings for a new citizen-based WTP, informed by political philosophy. Our model extends the standard social utility model (Bergstrom, 2006) of WTP for a public good when individuals are altruists by incorporating a Veil of Ignorance (VoI; Harsanyi, 1955). Our findings show that our WTP (Citizen) correctly includes altruistic as well as distributional preferences of individuals in society into WTP for use in a BCA. When WTP (Citizen) are aggregated for use in a BCA, equal weight is given to each individual's preference and the BCA will correctly identify potentially Pareto-improving projects in a consistent manner.