PREFACE TO THE COLLECTION PREAMBLE The editors are pleased to present a selection of Henri Theil's contributions to economics and econometrics in three volumes. In Volume I we have provided an overview of Theil's contributions, a brief biography, an annotated bibliography of his research, and a selection of published and unpublished articles and chapters in books dealing with topics in econometrics. Volume II contains Theil's contributions to demand analysis and information theory. Volume III includes Theil's contributions in economic policy and forecasting, and management science. The selection of articles is intended to provide examples of Theil's many seminal and path breaking contributions to economics in such areas as econometrics, statistics, demand analysis, information theory, economic policy analysis, aggregation theory, forecasting, index numbers, management science, sociology, operations research, higher education and much more. The collection is also intended to serve as a tribute to him on the occasion of his 67th birthday.! These three volumes also highlight some of Theil's contributions and service to the profession as a leader, advisor, administrator, teacher, and researcher. Theil's contributions, which encompass many disciplines, have been extensively cited both in scientific and professional journals. These citations often place Theil among the top 10 researchers (ranked according to number of times cited) in the world in various disciplines.

of Volume III.- Five Economic Policy and Forecasts.- 62 Econometric Models and Welfare Maximization.- 63 On the Theory of Economic Policy.- 64 A Note on Certainty Equivalence in Dynamic Planning.- 65 Macrodynamic Policy-Making: An Application of Strategy and Certainty Equivalence Concepts to the Economy of the United States, 1933-1936.- 66 Who Forecasts Best?.- 67 A Statistical Appraisal of Postwar Macroeconomic Forecasts in the Netherlands and Scandinavia.- 68 Some Observations on Adaptive Forecasting.- 69 Forecast Evaluation Based on a Multiplicative Decomposition of Mean Square Errors.- Six:Management Science, Operation Research and Quantitative Analysis.- 70 Management Science in Europe.- 71 Econometrics and Management Science: Their Overlap and Interaction.- 72 Quadratic Programming as an Extension of Classical Quadratic Maximization.- 73 The Effect of Forecasting Errors on Optimal Programming.- 74 Some Reflections on Static Programming under Uncertainty.- 75 A Procedure for Integer Maximization of a Definite Quadratic Function.- 76 Substitution Effects in Geometric Programming.- 77 Quantitative Economics in the Netherlands.- 78 On the Optimal Management of Research: A Mathematical Approach.- 79 Can Economists Contribute to Marketing Research?.- 80 The Cube Law Revisited.- 81 The Apportionment Problem and the European Parliament.