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Abstract
This study aims to analyze the relations of causality and price transmission
of the cassava root, the cassava starch, the cassava flour, the wheat, the wheat flour and
the corn, in the State of Parana. The used data goes from January 1995 to December
2005, with monthly regularity. It was applied the methodology of Granger causality to
test the relations between the variables. The results showed long term relations between
corn and cassava root prices, cassava starch and cassava flour prices, wheat and corn
prices and wheat and wheat flour prices. It was emphasized the dependence of the
cassava root prices in relation to corn, wheat, cassava starch and cassava flour prices
and its little influence on these variables. It was also noted that cassava flour prices
influenced the cassava starch prices, and the strong relation between the wheat prices
and the wheat flour prices. The cassava flour and the wheat prices presented lesser
dependence of the others variables. The paper concluded that there are important interrelations
between the studied variables. The cassava root prices were the ones that
depended most on the other variables in this study.