Dalylla S. Azevedo Federal University of Ceará   Av. Mister Hull, 2977 Campus do Pici, Bloco 826 Fortaleza, Ceara 60356-001 Brazil   dalylla_azevedo@yahoo.com.br             JEL Areas: F4 : Macroeconomic Aspects of International Trade and Finance: General Q1 : Agriculture: General