ALAMIN, Md. The Economics of “Free”: How Zero-Price Effects, Perceived Opportunity Cost, and Transaction Utility Shape Digital Purchase Decisions. American Journal of Applied Statistics and Economics, Delaware, USA, v. 5, n. 2, p. 140–151, 2026. DOI: 10.54536/ajase.v5i2.8502. Disponível em: https://journals.e-palli.com/home/index.php/ajase/article/view/8502. Acesso em: 2 oct. 2026.