Stefan Homburg – författare

The financial crisis of 2007 and the following recession present a major challenge to macroeconomic theory. The same holds true for exceptionally low interest rates during the recent years and for the puzzle that super-expansive monetary policies failed to produce high inflation. Approaches that focus on steady states, rational expectations, and individuals planning over infinite horizons, are not suitable for analysing such abnormal situations. A Study in Monetary Macroeconomics refines and improves mainstream approaches to resolve these puzzles and to contribute to a better understanding of monetary and fiscal policies.Using a rich institutional structure that includes features such as credit money, external finance, borrowing constraints, net worth, real estate and commercial banks, this timely study reduces rationality requirements to cope with its complex setting. It starts with a simple baseline model, deriving results from mathematical reasoning and simulations whilst adhering to the method of dynamic general equilibrium (DGE) with optimizing agents and fully specified models. Highly topical, A Study in Monetary Macroeconomics uses a unified theoretical framework to demonstrate that a DGE approach makes it possible to develop clean models that work outside steady states and are appropriate for answering macroeconomic questions of actual interest.

This book gives a comprehensive account of traditional and more recent developments in macroeconomic theory. It is primarily written for students at the intermediate level. The book differs from the customary expositions in that the authors do not discuss topic by topic, but doctrine by doctrine. Thus, the main approaches, such as Classical theory, Keynesian theory, theory of portfolio selection, monetarism, rational expectations theory, and Neokeynesian "disequilibrium" theory, are presented in historical order. Each of these approaches is substantiated and criticized in a self-contained chapter, and the authors have taken great efforts to bring out the relations and differences between them. A Mathematical Appendix contains reviews of those mathematical facts which are especially important to macroeconomic models and makes the text easy to read.

Dieses Buch bietet eine theoretische Analyse verschiedener Alterssicherungssysteme; ein Thema, das infolge der demographischen Entwicklung weltweit an Interesse gewinnt. Im Vordergrund steht ein Vergleich von Umlage- und Kapitaldeckungsverfahren. Die breit angelegte Untersuchung behandelt ebenso Fragen wie "staatliche versus private Alterssicherung". Im Rahmen eines "general equilibrium"-Ansatzes und unter Anstrebung größter Allgemeinheit (keine "steady state"-Annahmen) werden Probleme gelöst, die lange als unentscheidbar galten. So kann mit Hilfe einfacher mathematischer Techniken gezeigt werden, daß ein Umlageverfahren eine definitive Verringerung des Kapitalbestandes bewirkt. Als wichtig wird indes nicht die Höhe des Kapitalbestandes, sondern die Effizienz des Alterssicherungssystems angesehen. Dieses bisher kaum erörterte Problem wird in den Vordergrund gerückt, der Verfasser argumentiert, daß sich auf diese Weise verschiedene Dispute wie die "Feldstein-Kontroverse" auflösen und eindeutig entscheiden lassen.

Die hervorragende Aufnahme, die dieses Buch seit seinem erstmaligen Erscheinen im Jahr 1984 in der Fachwelt und bei den Studenten erfahren hat, zeigt, dass es den Autoren gelungen ist, den Leser umfassend in den derzeitigen Stand der makroökonomischen Theorie einzuführen.

This book contains a revised version of my Habilitationsschrift which has been accepted by the economic department of Dortmund University in 1991. It consists mostly of unpublished material which has been presented during the last years at the universities of Cologne, Dortmund, Hagen, Mannheim, and Munich and at a meeting in Wiesbaden. I am indebted to very many collegues for fruitful discussions. In par- ticular, I want to thank Friedrich Breyer, Johannes Hoffmann, Heinz Hollander, Wolfgang Leininger, Bruno Schonfelder, Gerhard Schwodi- auer, Hans-Werner Sinn, Klaus Spremann, and lochen Weimann, but this list is surely incomplete. I am especially grateful, however, to Wolfram F. Richter and Niko Wolik who have continually accompanied the evolution of this work and to whom lowe many suggestions as well as corrections. The remaining errors, needless to say, are mine. Cologne, September 1991 Stefan Homburg Contents Chapter 1. Introduction 1 Chapter 2. Dynamic Efficiency 3 2. 1 The Basic Model...3 2. 2 A General Theorem on Dynamic Efficiency . 9 2. 3 Some Further Results ...12 2. 4 Storable Consumer Goods...14 2. 5 The Failure of the First Basic Welfare Theorem 17 2.6 A Stronger Condition ...20 2. 7 A Remark on Necessary Conditions. 21 2. 8 Conclusion...22 Chapter 3. Interest and Growth 25 3. 1 Commodity Own Rates of Interest 26 3. 2 The Asset-augmented Economy . . 28 3. 3 Interest, Growth, and Dynamic Efficiency . 31 3. 4 Conclusion...33 Appendix: The Cash Flow Criterion.

This book gives a comprehensive account of traditional and more recent developments in macroeconomic theory. It is written primarily for students at the intermediate level. The book differs from the customary expositions in that the authors do not discuss topic by topic but orthodoxy by orthodoxy. Thus, the main approaches, like Classical theory, Keynesian theory, theory of portfolio selection, Monetarism, Rational Expectations theory, and Neokeynesian "disequilibrium" theory are presented in historical order. Each of these approaches is substantiated and criticized in a self-contained chapter, and the authors have taken great pains to bring out the relations and differences between them. A mathematical appendix reviews those mathematical facts which are especially important for macroeconomic models and serves to make the text easy to read.

Die Studie stellt einen ganzheitlichen, langfristig orientierten Entwurf zum Umbau der sozialen Sicherungssysteme vor. Sie ist Teil der Gemeinschaftsinitiative Soziale Marktwirtschaft, die von Bertelsmann Stiftung, Heinz Nixdorf Stiftung und Ludwig-Erhard-Stiftung getragen wird. Aus vertragstheoretischer Sicht werden ordnungspolitische Leitlinien begründet, denen ein System der sozialen Sicherung folgen sollte. Sodann untersucht die Studie für jeden Teil des sozialen Sicherungssystems – Sozialhilfe, Arbeitslosenversicherung, Alterssicherung, Kranken- und Pflegeversicherung – welche institutionellen Arrangements mit diesen Leitlinien bestmöglich in Einklang stehen. Im Rahmen einer finanzpolitischen Begleitung werden anschließend unerwünschte Umverteilungswirkungen ausgeglichen. Abschließend werden die gesamtwirtschaftlichen Auswirkungen quantifiziert.

This book contains a revised version of my Habilitationsschrift which has been accepted by the economic department of Dortmund University in 1991. It consists mostly of unpublished material which has been presented during the last years at the universities of Cologne, Dortmund, Hagen, Mannheim, and Munich and at a meeting in Wiesbaden. I am indebted to very many collegues for fruitful discussions. In par- ticular, I want to thank Friedrich Breyer, Johannes Hoffmann, Heinz Hollander, Wolfgang Leininger, Bruno Schonfelder, Gerhard Schwodi- auer, Hans-Werner Sinn, Klaus Spremann, and lochen Weimann, but this list is surely incomplete. I am especially grateful, however, to Wolfram F. Richter and Niko Wolik who have continually accompanied the evolution of this work and to whom lowe many suggestions as well as corrections. The remaining errors, needless to say, are mine. Cologne, September 1991 Stefan Homburg Contents Chapter 1. Introduction 1 Chapter 2. Dynamic Efficiency 3 2. 1 The Basic Model...3 2. 2 A General Theorem on Dynamic Efficiency . 9 2. 3 Some Further Results ...12 2. 4 Storable Consumer Goods...14 2. 5 The Failure of the First Basic Welfare Theorem 17 2.6 A Stronger Condition ...20 2. 7 A Remark on Necessary Conditions. 21 2. 8 Conclusion...22 Chapter 3. Interest and Growth 25 3. 1 Commodity Own Rates of Interest 26 3. 2 The Asset-augmented Economy . . 28 3. 3 Interest, Growth, and Dynamic Efficiency . 31 3. 4 Conclusion...33 Appendix: The Cash Flow Criterion.