TAN, Jieyou. A Comparative Study on Welfare Losses of Specific Duties and Ad Valorem Duties in Monopolistic Markets. Transactions on Economics, Business and Management Research, [S. l.], v. 18, p. 316–322, 2026. DOI: 10.62051/022m2c97. Disponível em: https://tebmr.org/index.php/ojs/article/view/97. Acesso em: 21 jul. 2026.