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GTAP Resource #5192

"CGEBox: A flexible, modular and extendable framework for CGE analysis in GAMS"
by Britz, Wolfgang

We present a GAMS based framework for Computable General Equilibrium analysis which can be flexibly configured to depict different nestings in production and factor supply, while allowing a choice between different functional forms for demand and modeling international trade sectors (Armington, Armington plus CET, Melitz and Krugmann model). Either a regional household approach or separate accounts for government and potentially multiple private household with related closures are available. Supply and factor markets can be dis-aggregated to sub-regions. We compare the layout of different well-known global and single country CGE models and discuss to what extent our flexible framework can replicate these features. In a structural sensitivity analysis, we compare major results of test shocks (multi-lateral trade liberalization and endowment changes in one country) by our framework under different configuration. These reflect important structural differences between the chosen examples as well as additional features such as the Melitz model or endogenous capital stocks driven by investments in a comparative-static setting. We find relative limited differences between models based on the Armington assumption, even if other features differ such as closures, the production function nesting, allowing for substitution on different nodes of the nest, for sluggish factor supply between agricultural and non-agricultural sectors and other elements such as the functional form in demand. A discussion on further joint development of such a framework leads to our summary and conclusions.

Resource Details (Export Citation) GTAP Keywords
Category: 2017 Conference Paper
Status: Published
By/In: Presented at the 20th Annual Conference on Global Economic Analysis, West Lafayette, IN, USA
Date: 2017
Created: Britz, W. (3/21/2017)
Updated: Britz, W. (6/12/2017)
Visits: 3,373
- Model validation and sensitivity analysis
- Software and modeling tools

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Public Access
  File format GTAP Resource 5192  (716.8 KB)   Replicated: 0 time(s)
  File format Slides as presented at the conference on the paper  (830.7 KB)   Replicated: 0 time(s)

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Special Instructions
Please use this version of the document - there was an error, the same numbers were erroneously reported in two tables.

Comments (2 posted)
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Posted by: Antonio, Katherine   7/17/2017 3:46:00 PM
I am GAMS user. I am using GTAP in GAMS developed by Rutherford. I am taking the course of GTAP and using GAMS for my dissertation. I wonder if it is possible to access to the code.


Posted by: Britz, Wolfgang   7/18/2017 3:09:00 AM
Dear Katherine,

The GAMS code of CGEBox is open source and the Java binaries needed to run its Graphical User Interface (GUI) are for free. Please have a look at: "" where you find a link to a detailed user guide including installation instructions as welll as training videos to work with the GUI.

Please note however that the GAMS code is NOT derived from Tom Rutherford's code, but from ENVISAGE. Furthermore, as a reminder: you need a GAMS license including CONOPT to run the model.

Good luck for your dissertation.