Feedback links between economy-wide and farm-level policies: With application to irrigation water management in Morocco

Terry Roe, Ariel Dinar, Yacov Tsur, Xinshen Diao

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


This paper focuses on policy interventions for improving irrigation water allocation decisions by including both macro and micro considerations in a unified analytical CGE framework. The approach is demonstrated, using the case of Morocco, by analyzing selected policy (top-down and bottom-up) interventions and external shocks that affect the water sector. Both direct and indirect effects of these interventions are identified. The top-down (macro-to-micro) links are of a trade reform type. The bottom-up (micro-to-macro) links pertain to changes in farm water assignments and the possibility of water trading. We find that water productivity is strongly influenced by these policies, with the general equilibrium (indirect) effects modifying and sometimes reversing the partial equilibrium (direct) effects. We also find that the impacts of the two reforms we assessed are different, with trade reform having an absolute impact of a higher magnitude than the water reform. Finally, we show that the sequence of introducing the policy reforms matters. We also demonstrate the usefulness of our model approach in the case of the Water Directive Framework and the Common Agricultural Policy, both applied in EU countries in an antagonistic manner.

Original languageEnglish (US)
Pages (from-to)905-928
Number of pages24
JournalJournal of Policy Modeling
Issue number8
StatePublished - Nov 2005

Bibliographical note

Funding Information:
This paper is the result of the first phase of the research project “Macro–micro Linkages of Irrigated Water Management” supported by funding from RSBRA and DECRG of the World Bank. Review comments by Erol Cakmak, Rachid Doukkali, and Rashid Hassan are acknowledged. Suggestions by Gershon Feder, and comments from participants of the Workshop Irrigation Water Policies: Micro and Macro Considerations, Agadir Morocco, June 15–17, 2002, and from participants of the ABCDE World Bank Conference May 3–4, 2004 in Washington, DC, are greatly appreciated. The views expressed in this paper are those of the authors and should not be attributed to the World Bank.


  • Computable general equilibrium
  • Feedback links
  • Irrigation water
  • Morocco
  • Trade reform
  • Water market


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