International Model for Policy Analysis of Agricultural Commodities and Trade-Standard IFPRI Multimarket Model (IMPACT-SIMM): Technical Description for Version 1

IFPRI Discussion Paper 2083

40 Pages Posted: 1 Mar 2022

See all articles by Sherman Robinson

Sherman Robinson

International Food Policy Research Institute (IFPRI)

Lillian Anderson

International Food Policy Research Institute (IFPRI)

Shanila Dunston

International Food Policy Research Institute (IFPRI)

Sherwin Gabriel

CGIAR - Environment and Production Technology Division

Adam Komarek

University of Queensland, Gatton, Australia

Daniel Mason-D’Croz

Cornell University

Timothy Sulser

International Food Policy Research Institute (IFPRI)

Date Written: December 31, 2021

Abstract

The International Food Policy Research Institute’s International Model for Policy Analysis of Agricultural Commodities and Trade (IMPACT) supports analysis of long-term challenges and opportunities for food, agriculture, and natural resources at global and regional scales. IMPACT is continually being updated and improved to better inform the choices that decisionmakers face today. This document describes a new country-level version of the model. IMPACT-SIMM (International Model for Policy Analysis of Agricultural Commodities and Trade–Standard IFPRI Multimarket Model) is a partial equilibrium, multi-market, simulation model of the production, supply, and demand of agricultural commodities within a country or group of countries. It simulates the operation of agricultural markets, solving for equilibrium prices within a country and, in multi-country mode, global markets. It is designed to be a “portable” and potentially open-source version of the IFPRI (International Food Policy Research Institute) IMPACT3 model documented in Robinson et al. (2015). IMPACT-SIMM shares model specification, equations, and computer code with IMPACT3, but is designed to be more flexible in application. It allows users to specify a standard multi-market model at any level of aggregation by commodities and countries by changing data inputs, without any change in model code. This model system supports longer-term scenario analysis to provide researchers and policymakers with a flexible tool to assess and compare the potential effects of changes in biophysical systems, socioeconomic trends, technologies, and policies at the level of individual countries or groups of countries.

Keywords: commodities, trade, climate change, technological changes, commodity markets, prices, nutrition, ex ante impact assessment, modelling, agriculture, international trade, IMPACT model, multimarket model

Suggested Citation

Robinson, Sherman and Anderson, Lillian and Dunston, Shanila and Gabriel, Sherwin and Komarek, Adam and Mason-D’Croz, Daniel and Sulser, Timothy, International Model for Policy Analysis of Agricultural Commodities and Trade-Standard IFPRI Multimarket Model (IMPACT-SIMM): Technical Description for Version 1 (December 31, 2021). IFPRI Discussion Paper 2083, Available at SSRN: https://ssrn.com/abstract=4003553

Sherman Robinson (Contact Author)

International Food Policy Research Institute (IFPRI) ( email )

1201 Eye St, NW,
Washington, DC 20005
United States

Lillian Anderson

International Food Policy Research Institute (IFPRI) ( email )

2033 K Street, NW
Washington, DC 20006
United States

Shanila Dunston

International Food Policy Research Institute (IFPRI) ( email )

1201 Eye St, NW,
Washington, DC 20005
United States

Sherwin Gabriel

CGIAR - Environment and Production Technology Division ( email )

2033 K Street, NW
Washington, DC 20006
United States

Adam Komarek

University of Queensland, Gatton, Australia ( email )

Brisbane
Australia

Daniel Mason-D’Croz

Cornell University ( email )

Ithaca, NY 14853
United States

Timothy Sulser

International Food Policy Research Institute (IFPRI) ( email )

1201 Eye St, NW,
Washington, DC 20005
United States

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