VARIAN, Hal R. Differential Pricing and Efficiency. First Monday, [S. l.], v. 1, n. 2, 1996. DOI: 10.5210/fm.v1i2.473. Disponível em: https://firstmonday.org/ojs/index.php/fm/article/view/473. Acesso em: 18 apr. 2024.