IS THERE NON-LINEARITY IN THE CONVERGENCE OF PRICES FOR AGRICULTURAL MARKETS IN BRAZIL?

Abstract

This paper explores the methods for testing unit roots with Threshold Autoregressive (TAR) for panel data, with emphasis on the econometric technique elaborated by Beyaert and Camacho (2008) and adapted for the Brazilian agricultural sector by Tabosa, Ferreira and Castelar (2014). Therefore, if the Single Price Law is established, it is said that there is convergence of prices in the various markets analyzed, implying that prices converge to a given steady state, in other words, a long-term equilibrium price. The first tests do not reject the null hypothesis that the model to be estimated is linear (Evans-Karras model). The results pointed to markets that converge in the long run.