[1] Univ Ghent, Dept Agr Econ, B-9000 Ghent, Belgium
[2] Makerere Univ, Dept Agribusiness & Nat Resources Econ, POB 7062, Kampala, Uganda
[3] Mt Moon Univ, Fac Agr & Environm Sci, POB 837, Ft Portal, Uganda
[4] Univ Greenwich, Nat Resources Inst, Food & Markets Dept, Chatham ME4 4TB, Kent, England
[5] Flanders Res Inst Agr Fisheries & Food ILVO, Social Sci Unit, B-9820 Merelbeke, Belgium