PROF. ALEXANDRU TRIFU PH. D. The Marginal Diminishing Returns/Marginal Increasing Returns in The Pursuit of Happiness. Global Journal of Management and Business Research, [S. l.], v. 20, n. B1, p. 9–12, 2020. Disponível em: https://journalofbusiness.org/index.php/GJMBR/article/view/3004. Acesso em: 3 may. 2024.