Coffee exporters.
You visit the farmers to buy their coffee. The farmers are scattered over a wide area,so you have to pay for transport and fuel to go and collect their coffee cherries. You then process them to extract the green beans, pack them in bags, and transport them to the coast, where you sell them to a shipping company. Uganda is landlocked, so you have to pay high rail-freight charges. The market for coffee is unpredictable, and so you sometimes have to pay to have your coffee stored. You also need money to renew and repair the expensive machinery in the factory and to pay skilled people to operate it.