However, if higher income is accompanied by greater age which is what we expect because greater age is often accompanied by greater experience part of the effect that is really from the age could be the result of the effect that total expenditure has.
Sin embargo, si mayores ingresos van acompañados de mayor edad, que es lo que esperamos ya que a mayor edad, mayor experiencia, parte del efecto que realmente tiene la edad podríamos estarlo observando en el efecto que tiene el gasto total.