George Lady

Professor George LadyProfessor
817 Ritter Annex
Temple University
Philadelphia, Pennsylvania 19122


Qualitative comparative statics and stability, Energy economics


Diploma: Sidwell Friends School, Washington, D.C., 1957.
A.B.(Economics): The George Washington University, 1961.
A.M.(Economics): The George Washington University, 1963.
Ph.D.(Political Economy): Johns Hopkins University, 1967.

Teaching responsibilities have included: macro- and microeconomic theory, mathematical economics, energy economics, and computer assisted economic analysis. Research interests include models of options pricing, futures pricing as measures of market expectations, energy product pricing and depletion rents, statistical and convex programming approximations of process models, efficient algorithms to detect qualitatively decidable magnitudes in economic models, and conceptual and algorithmic methods to assess the information content of mathematical models. Recent research projects include the development of software based analysis techniques designed to assess the elements of an inverse Jacobian matrix based upon a nonparametric specification of the Jacobian matrix. The computer programs apply mathematical results derived separately on the stability and invertibility of matrices as related to characteristics of their signed directed graphs. Applications of the results have been ! found in computer model quality control and the evaluation of econometric models.

Selected Publications

  • Nonparametric Comparative Statics and Stability (with Hale, Maybee, and Quirk), Princeton University Press, 1999.
  • “Topics in Nonparametric Comparative Statics and Stability,” International Advances In Economic Research, 5, February 2000, pp. 67-83.
  • “Falsifying Economic Models” (with Andrew Buck), Economic Modelling, 22, September 2005, pp. 777-810.
  • “The Scope of the LeChatelier Principle” (with James Quirk), Physica A: Statistical Mechanics and its Applications, 381, April 2007, pp. 351-365.
  • “Evaluating Long Term Forecasts,” Energy Economics, Vol. 32, Issue 2, March 2010, pp.450-457.
  • “The Global LeChatelier Principle and Multimarket Equilibria,” (with James Quirk), The Review of Economic Design, 14, 1, March 2010, pp. 193-201.
  • “Structural Models, Information and Inherited Restrictions,” with Andrew Buck, Economic Modelling, 28, 2011, pp. 2820-2831..
  • “Structural Sign Patterns and Reduced Form Restrictions, “ with Andrew Buck, Economic Modelling, 29, 2012, pp. 462-470.
  • “A New Approach to Model Verification, Falsification and Selection,” (with Andrew Buck), Econometrics 2015, 3(3), DOI: 10.3390/econometrics3030466, June 1015, pp.466-493. On line:
  • “Estimating a Falsified Model” (with Andrew Buck), Advances in Pure Mathematics, 2016, 6, 523-531.  On line:

Courses Taught

  • Economics 1102, 3501, 3544, 3598