Resource Center

Advanced Search
Technical Papers
Working Papers
Research Memoranda
GTAP-L Mailing List
CGE Books/Articles
Important References
Submit New Resource

GTAP Resources: Resource Display

GTAP Resource #307

"Implementing Quotas in GTAP Using GEMPACK or How to Linearize an Inequality"
by Bach, Christian Friis and Ken Pearson

Note added March 2002, updated September 2007

The methods described in the paper below have been automated as part of Release 8.0 of GEMPACK. This new version of GEMPACK (which is being beta tested by several modellers now and will be officially released later in 2002) makes it very easy to implement quotas (including import/export quotas and tariff rate quotas). This means that many of the implementation details in the technical paper below are no longer required. To implement quotas etc in GEMPACK, please follow the methodology documented in chapter 16 of GEMPACK User documentation GPD-3, which you can find at If unsure, please contact

1996, September.

This document describes how explicit import and export quotas can be implemented and solved in the GTAP CGE trade model. The techniques described here apply equally well to other general and partial equilibrium models implemented and solved using the GEMPACK software. They also generalise to procedures for handling other inequalities in models solved via GEMPACK (even though GEMPACK does not allow explicit inequalities in the algebraic representation of models). In this document we review some recent applications of GTAP in which explicit import and export quotas have been modelled, and discuss how important it was for these applications to have explicit treatment of quotas.

Accompanying this document are various computer files containing the ingredients of examples that readers can carry out for themselves while reading this paper. These files can also be used as a starting point for those who wish to explicitly model quotas in their own models.

Resource Details (Export Citation) GTAP Keywords
Category: Technical Paper
Status: Published
By/In: GTAP Technical Paper No. 04
Date: 1996
Created: Bacou, M. (9/27/2000)
Updated: Batta, G. (1/28/2014)
Visits: 8,810
- Software and modeling tools
- Calibration and parameter estimation

If you have trouble accessing any of the attachments below due to disability, please contact the authors listed above.

Public Access
  File format Data   (96.7 KB)   Replicated: 0 time(s)
  File format GTAP Resource 307   (129.1 KB)   Replicated: 0 time(s)

Restricted Access
No documents have been attached.

Special Instructions
Technical Paper Number 4 can be downloaded in PDF format.

For those interested in replicating the results in this technical paper, an associated zip file can be downloaded. The zip file includes a readme file with detailed instructions.

Comments (0 posted)
You must log in before entering comments.

No comments have been posted.