Altruism in cost-benefit analysis

It has recently been argued that altruistic motives for paying for a public sector project should be ignored in a cost-benefit analysis. The reason is that including altruism would mean a kind of double counting of the project's benefits. This paper takes a look at these arguments, and derives cost-benefit rules which cover different kinds of altruism. The paper also provides some recommendations for the treatment of altruism in studies using the contingent valuation method.