Trade theory in computable general equilibrium models:Armington, Krugman and Melitz

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This book is for people who want to understand modern trade theory, particularly the Melitz model. It lays out Melitz theory from first principles and relates it to earlier theories of Armington and Krugman. For trade theory specialists, the book produces some significant conclusions. It identifies conditions under which Krugman and Melitz models produce essentially the same results for the welfare effects of trade liberalization as those obtained from Armington, and conditions under which this is not true. These findings will be of interest to academics and policy advisors who need to understand critiques of Armington by proponents of Krugman and Melitz.
For computable general equilibrium (CGE) modelers, the book shows how Melitzstyle CGE models can be calibrated, solved and interpreted. A major practical contribution of the book is to show how largescale Armington models such as GTAP can be converted to Melitz by the addition of a small number of equations and minimal alteration of the original Armington model.
The book describes computational experience in solving Melitz CGE models using GEMPACK software. This experience will be of interest to researchers currently attempting to solve Melitzbased CGE models. Almost all previous Melitz studies have used GAMS software. Authors of these studies have reported computational difficulties. These difficulties did not occur in this book’s GEMPACKbased computations.
The book concludes that: (a) CGE modelers can embrace Melitz while retaining their Armingtonbased models as powerful interpretive devices; and (b) via GEMPACK, largescale CGE models incorporating Melitz specifications can be solved with no more difficulty than similardimensioned Armington models. This book is for people who want to understand modern trade theory, particularly the Melitz model. It lays out Melitz theory from first principles and relates it to earlier theories of Armington and Krugman. For trade theory specialists, the book produces some significant conclusions. It identifies conditions under which Krugman and Melitz models produce essentially the same results for the welfare effects of trade liberalization as those obtained from Armington, and conditions under which this is not true. These findings will be of interest to academics and policy advisors who need to understand critiques of Armington by proponents of Krugman and Melitz.
For computable general equilibrium (CGE) modelers, the book shows how Melitzstyle CGE models can be calibrated, solved and interpreted. A major practical contribution of the book is to show how largescale Armington models such as GTAP can be converted to Melitz by the addition of a small number of equations and minimal alteration of the original Armington model.
The book describes computational experience in solving Melitz CGE models using GEMPACK software. This experience will be of interest to researchers currently attempting to solve Melitzbased CGE models. Almost all previous Melitz studies have used GAMS software. Authors of these studies have reported computational difficulties. These difficulties did not occur in this book's GEMPACKbased computations.
The book concludes that: (a) CGE modelers can embrace Melitz while retaining their Armingtonbased models as powerful interpretive devices; and (b) via GEMPACK, largescale CGE models incorporating Melitz specifications can be solved with no more difficulty than similardimensioned Armington models. This book is for people who want to understand modern trade theory, particularly the Melitz model. It lays out Melitz theory from first principles and relates it to earlier theories of Armington and Krugman. For trade theory specialists, the book produces some significant conclusions. It identifies conditions under which Krugman and Melitz models produce essentially the same results for the welfare effects of trade liberalization as those obtained from Armington, and conditions under which this is not true. These findings will be of interest to academics and policy advisors who need to understand critiques of Armington by proponents of Krugman and Melitz.
For computable general equilibrium (CGE) modelers, the book shows how Melitzstyle CGE models can be calibrated, solved and interpreted. A major practical contribution of the book is to show how largescale Armington models such as GTAP can be converted to Melitz by the addition of a small number of equations and minimal alteration of the original Armington model.
The book describes computational experience in solving Melitz CGE models using GEMPACK software. This experience will be of interest to researchers currently attempting to solve Melitzbased CGE models. Almost all previous Melitz studies have used GAMS software. Authors of these studies have reported computational difficulties. These difficulties did not occur in this book's GEMPACKbased computations.
The book concludes that: (a) CGE modelers can embrace Melitz while retaining their Armingtonbased models as powerful interpretive devices; and (b) via GEMPACK, largescale CGE models incorporating Melitz specifications can be solved with no more difficulty than similardimensioned Armington models.
內容簡介來源:
Chapter 1. Introduction: What’s in the Book and How to Read It
Chapter 2. Armington, Krugman and Melitz as Special Cases of an Encompassing Model
Chapter 3. Optimality in the Armington, Krugman and Melitz Models
Chapter 4. Calibration and Parameter Estimation for a Melitz Sector in a CGE Model
Chapter 5. Melitz equals Armington Plus Endogenous Productivity and Preferences
Chapter 6. Illustrative GEMPACK Computations in a General Equilibrium Model with Melitz Sectors
Chapter 7. Converting an Armington Model into a Melitz Model: Giving Melitz Sectors to GTAP
Chapter 8. Summary and Concluding Remarks
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