Based on original trader surveys, this paper examines how agricultural traders operate in two subSaharan African countries, Benin and Malawi. Results indicate that the largest transaction costs are search and transport. Search methods rely principally on personal vis its by the trader himself or herself, which raises search costs. Since enterprises are very small, transport represents a large share of marketing costs. Brand recognition, grading, and quality certification are non-existent. Brokers and agents are not organized in commodity exchanges. Quantities are not pooled for transport and storage so as to achieve returns to scale. Inter-seasonal and inter-regional arbitrage is outside the purview of most traders, who prefer to operate in a small territory on a day-by-day basis. The information presented here provides some important insights as to how agricultural trade can be improved. Policy interventions can be conceived in four main areas: (i) increasing traders' asset base; (ii) reducing transaction risk; (iii) promoting more sophisticated business practices; and, (iv) reducing physical marketing costs.