Global Trade Analysis Project (GTAP)

The Global Trade Analysis Project (GTAP) is a global network of researchers and policy makers conducting quantitative analysis of international policy issues. GTAP is coordinated by the Center for Global Trade Analysis in Purdue University's Department of Agricultural Economics.

Current Highlights

New Working Paper

GTAP Working Paper

Volume Preserving CES and CET Formulations

by van der Mensbrugghe, Dominique and Jeffrey C. Peters

As economists are increasingly working across disciplines, they are assessing alternative mathematical formulations to more closely align with the results from these disciplines. Two of the most widely used functional forms in quantitative economic analysis are the constant-elasticity-of-substitution (CES) and constant-elasticity-of-transformation (CET) functions. However, neither functional form preserves volume additivity, which may be a desirable feature in a number of contexts including labor and land allocation, energy systems, etc. This paper explores two alternatives to the ubiquitous CES and CET formulations, which have many of the same characteristics in terms of ease of implementation, but also preserve volume additivity. It illustrates some of the properties of the so-called additive forms of the CES and CET and assesses the impacts of switching to the additive CET in the context of land-use allocation in the Envisage model.


GTAP Working Paper No. 87

Information Updated

23rd Annual Conference on Global Economic Analysis
"Global Economic Analysis Beyond 2020"
June 17-19, 2020  |   Virtual Meeting

Dates/Deadlines (USA Eastern Time Zone)
Abstracts / Session Proposals Nov 4 - Jan 15
Abstract Review Jan 21 - Feb 16
Acceptance Notifications Feb / Mar
Final Papers Apr 15
Registrations Feb - Apr 30
Presenter Registration Apr 30
Final Presentations May 17
Non-Presenter Registration Jun 7
Due to the COVID-19 outbreak, this year’s GTAP Conference will be held online. Visit the conference homepage for further details.
2020 GTAP Firm Heterogeneity Course
"Applied Policy Analysis with Advanced Trade Theories"
October 5 - November 22, 2020

Dates/Deadlines (USA Eastern Time Zone)
Applications April 6 - July 19
Acceptance Notifications August
The GTAP-HET Course is a hands-on, fully-online course developed to provide professional economists and Masters/PhD students with the tools and skills necessary to use advanced trade theories in trade policy analysis. During the course, participants will:
  • learn about the Melitz model of heterogenous firms, viewed as a more general version of the Krugman model of monopolistic competition, and Armington model with perfect competition;
  • develop skills to use the GTAP Firm Heterogeneity (GTAP-HET) Model where Armington, Krugman, and Melitz models are nested in the GTAP computable general equilibrium framework;
  • conduct trade policy experiments and interpret simulation results using the GTAP-HET Model in team-based research projects.
2020-2 GTAP 101 Course
"Introduction to Computable General Equilibrium Modeling in the GTAP Framework"
September 7 - October 25, 2020

Cover image for Computable General Equilibrium Models
Dates/Deadlines (USA Eastern Time Zone)
Course Application March 2 - June 21
Acceptance Notifications late July

Coursework based on:
Introduction to Computable General Equilibrium Models, 2e
by Mary E. Burfisher

The objective of GTAP 101 is to engage participants in an active, team-based process of learning about the GTAP CGE model and its use in applied economic policy analysis. The curriculum is geared to advanced undergraduates, graduates and professionals. Following the course, participants will be entry-level modelers and more informed consumers of CGE-based analyses.

Global Future: Assessing The Global Economic Impacts of Environmental Change to Support Policy-Making

This report summarises the headline results and policy recommendations from the Global Futures project. A full description of the project background, objectives, methodology, results and conclusions is provided in the accompanying Technical Report, available here. The report is based on a project concept developed and funded by WWF.

Read more

Journal of Global Economic Analysis

JGEA Cover Page

The Center for Global Trade Analysis is pleased to announce the latest issue of the Journal of Global Economic Analysis has been released. All articles are open access and include supplementary files that allow for replication of results.

The Journal of Global Economic Analysis, Vol 4, No 2 (December 2019) includes the following articles:

Authors interested in submitting their work to the this publication are invited to read the Journal's Focus and Scope and Author Guidelines.


Organizations interested in posting an announcement below and on the GTAP-L Mailing List should email complete details, including contact information and closing dates, to

GTAP Events Deadline
Conference - Non-Presenter RegistrationJun 7, 2020
GTAP 101 Course - ApplicationsJun 21, 2020
GTAP-HET Course - ApplicationsJul 19, 2020

Network Events/Notices Deadline
CoPS - Intro GE Modelling Course (Zoom)Jun 30, 2020

Job/Professional Opportunities Deadline
Universität Kiel - Post-DocJun 1, 2020

GTAP Support

GTAP Network members in need of technical support are encouraged to use the following avenues to request assistance. General, non-technical inquiries may be addressed to

    The Center for Global Trade Analysis maintains a searchable repository of frequently asked questions on many different aspects of GTAP.
  • GTAP Support Email is an account monitored by the Center for Global Trade Analysis' data team. Network members can email to reach a GTAP staff member for technical support on any GTAP product.
  • GTAP-L Mailing List
    GTAP-L is an email-based list to which many members of the GTAP Network subscribe in order to receive updates on the GTAP Data Base, model, events, jobs and technical assistance. For further information, to subscribe or to access a searchable archive of GTAP-L messages, please visit the GTAP-L Mailing List homepage

Twitter @GTAP_Purdue