Quizas es que si el precio es constante y tienes una constante en tu modelo, eso crea multicolinealidad, y elimina una de las variables Antonio -- Member, Editorial Committee, *The Economic and Labour Relations Review* (a SAGE journal) http://elr.sagepub.com/ Member, Editorial Committee, African Journal of Economic and Management Studies http://emeraldgrouppublishing.com/products/journals/editorial_team.htm?id=ajems https://www.researchgate.net/profile/Antonio_Andres (Research Gate profile) [[alternative HTML version deleted]]