Tariffs are also found to have a significant negative impact on agricultural trade. Yet, despite the higher level of tariffs on agricultural products, the analysis shows that their impact is not necessarily stronger than on manufactures. On average, a reduction of tariffs by 10% would increase trade value by about 3.7%. Although data limitations have not allowed controlling for the impact of other trade-cost related constraints, such as standards and conformity assessment, and access to credit, case studies have illustrated how badly these constraints affect the agricultural trade performance of developing countries, in particular as regards small and medium agricultural producers, processors and traders.