For subsistence farmers, prices and markets are irrelevant. The effect of higher yield would be that less of their land needs to be devoted to growing rice, le

For subsistence farmers, prices and markets are irrelevant. The effect of higher yield would be that less of their land needs to be devoted to growing rice, leaving some free land for growing other foods. In anything approaching a free market, it is hard to imagine that lower production costs won't reduce the price of a heavily-traded commodity with millions of producers. In a communist system of collective farms, or a fascist system of government-mandated prices with monopolistic distribution networks, it is anyone's guess what political decisions will be made. Such systems regularly produce politically-motivated famines, so slightly lower nutrient levels will be the least of their worries.