Finance 56, 815.849. Levy M, Solomon S, 1996. Power Laws are Logarithmic Boltzmann Laws. International Journal of Modem Physics C, 7 (4), 595-600. Lewis WA, 1954. Economic Development with Unlimited Supplies of Labor. The Manchester School of Economic and Social Studies, 22(2): 139.191. Loster M, 2006.