Mmari, D.

coffee production market smallholder tanzania sisal export institution price grower outgrower quality sugar estate organization company competitiveness productivity development policy chain chapter industry structure labour agriculture producer value output processing study association farmer system state coordination trade change growth activity economy country figure fibre intermediary process innovation export crops world service research investment supply table source problem credit marketing dar es salaam constraint example member factor level sector kilombero government arrangement field board context increase salaam mtibwa commodity support decline transaction plantation period