Mother Jones: He's sitting behind a wooden table piled with a dozen tilapia and Nile perch at the market in Katoro, a roadside town in northern Tanzania. The fish--a staple of the Tanzanian diet--came in that morning from Lake Victoria, an hour's drive north. Around us, hundreds of shoppers are snatching up pineapples, textiles, and motorcycle parts. But Mohammed explains that basic economics is keeping customers away from his fish.
"There's less fish," he says. "So the price goes up, so customers can't afford...