The marketing mix at a free fair. Research, Society and Development, [S. l.], v. 10, n. 4, p. e49610414354, 2021. DOI: 10.33448/rsd-v10i4.14354. Disponível em: https://rsdjournal.org/rsd/article/view/14354. Acesso em: 5 dec. 2025.