Before revision:  By theoretical analysis, we obtain the mean-field solution of money-transport models and find thatthe scaling exponent can be determined from the  average degree of the nearest neighbours , which is one of the cardinal features of a network .
After revision:  By theoretical analysis, we obtain the mean-field solution of money-transport models and find thatthe scaling exponent can be determined from the power law of the average degree of the nearest neighbours , which is one of the cardinal features of a network .