OSHO, G. S. Market Failure In African Agricultural Marketing Systems: An Econometric Testing And Analysis Of Market Efficiency. International Business & Economics Research Journal (IBER), [S. l.], v. 6, n. 9, 2007. DOI: 10.19030/iber.v6i9.3407. Disponível em: https://clutejournals.com/index.php/IBER/article/view/3407. Acesso em: 17 jul. 2024.