It seemed like a great business model. Several years ago, I worked with a young solopreneur in Liberia – let’s call her Lucie – helping her with a business plan. She had figured out that she could make good money by purchasing agricultural produce that’s plentiful in one county (say, palm oil) and selling it in nearby counties where there was little supply but high demand, thus bringing higher prices. Even better, while she was in one county selling the palm oil, Lucie would