“A Contingent Valuation Approach to Household’s Willingness to Pay for Improved Piped Water Access in North Wollo Zone, Ethiopia”. Ethiopian Journal of Economics 33, no. 2 (April 30, 2026): 63–97. Accessed August 20, 2026. https://ethiopianjournalofeconomics.org/index.php/EJE/article/view/490.