Summary
In this study, the external costs of the tea supply chain (smallholder cultivation in Kenya) were investigated to inform decision making for IDH's tea program. The external costs of conventional green leaf were compared to green leaf grown by smallholder farmers active in the farmer Field School (FFS) program. Compared to other sectors (Ivorian cocoa, Vietnamese coffee, Indian cotton), the external costs of tea cultivation in Kenya are relatively low per kg of farm product.