Yeah, but people eat different things. If you are dirt poor and put before eating roti or rice with your dal, you will go for either of which is the cheaper option. Wheat got more expensive in recent years due to droughts in Australia and Canada + ethanol pressure. But now rice is also getting expensive, because of flooding, and there is no cheap wheat to replace the rice. Maybe they even feed rice to some cattle for meat production, who knows. So anyway, now you're poor and both rice and wheat are expensive. You protest. Meanwhile, the EU legislates mandatory ethanol content in gasoline to insure your starvation. You die.