A Contingent Valuation Approach to Household’s Willingness to Pay for Improved Piped Water Access in North Wollo Zone, Ethiopia. Ethiopian Journal of Economics, [S. l.], v. 33, n. 2, p. 63–97, 2026. Disponível em: https://ethiopianjournalofeconomics.org/index.php/EJE/article/view/490.. Acesso em: 18 aug. 2026.