Zaal, F.

trade cattle africa cattle trade west africa policy livestock marketing african market export government kenya pattern government policies trader demand country trade flows development import ivory coast distance trade board production sub-saharan africa nigeria change tanzania cattle marketing ghana european trade policies burkina faso coast animal union supply price drought example region producer consumer distance ivory pastoralist intervention niger state economy settler european union world sub-saharan product pre-colonial number consequence period increase livestock trade marketing boards addition currency control custom creation impact government interventions official trade creation food trade world market kerven burkina organisation devaluation diversion measure