nars/LCAPM_Iee.pdf Lettau M, Ludvigson S, 2001. Consumption, aggregate wealth, and expected stock returns. Journal of 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 wi