For years, anti-poverty campaigners railed against low commodity prices, which depressed farmers' incomes in developing countries. In recent months, the world price of virtually all staples has shot up, but the activists are still not cheering. They worry that this boom (intensified by "green' subsidies for biofuel crops) may worsen poverty even more than low agricultural prices did. High food prices do help poor farmers, but they also hurt the more numerous category of people (poor city-dwellers as well as landless rural folk) who must buy food to survive. That "unintended consequence'