Cost-benefit analysis (CBA) is indispensable for making good decisions on what transport projects to fund. It essentially aims to figure out which projects offer the best value for money. However, the practical relevance of CBA does not always live up to its appeal in principle. One problem is...

The provision of water supply, sanitation and wastewater services generates substantial benefits for public health, the economy and the environment. Benefit-to-cost ratios can be as high as 7 to 1 for basic water and sanitation services in developing countries. Wastewater treatment...