In this study, tomato (Lycopersicon esculentum Mill.) demand changes are estimated through the estimation of elasticity (-0.587) within the Almost Ideal Demand System (AIDS). Such estimation is compared to the elasticity (-0.10) obtained in other research, all referred to foreseeing changes in quantity demanded. The results showed that there is an underestimation of 17 % in quantities obtained through the elasticity proposed by such research; it is stated that underestimation is due to the lack of economic choice axioms.

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