Araújo de Carvalho, Francisco Prancacio, Jesusmar Ximenes Andrade, and João Batista Lopes. “Essay on the Effect of Employment and Income: The Contrast of the Elasticities of the Regions of Brazil and the Reality of Piauí”. Gaia Scientia 14, no. 1 (May 20, 2021). Accessed August 16, 2024. https://periodicos.ufpb.br/index.php/gaia/article/view/39411.