January 2000 - People in Sofia are willing to pay 4.2 percent of their income or more for a program to improve air quality. Through a survey, Wang and Whittington study willingness to pay for improvements in air quality in Sofia, Bulgaria. Using a stochastic payment card approach - asking...

One of the major difficulties in doing cost-benefit analysis of a development project is to estimate the total economic value of project benefits, which are usually multi-dimensional and include goods and services that are not traded in the market. Challenges also arise in aggregating the values...