Giordani, Paolo E. and Zamparelli, Luca (2007): The Importance of Industrial Policy in Quality-Ladder Growth Models. Unpublished.
Smith, James D (2001): Competition-through-innovation: The third industrial stage. Published in: Essays in Economic and Business History , Vol. XIX, (2001): pp. 265-272.
zamparelli, luca (2007): Average Cost and Marginal Cost Pricing in Marshall: Textual Analysis and Interpretation. Unpublished.
