"The new protectionism is driven as much by nostalgia and deep-seated emotion as by economic self-interest and political power. Yet it will achieve nothing, because “protecting” ageing industries does not work. That is the clear lesson of 70 years of farm subsidies. The old crops—corn (maize), wheat, cotton—into which America has pumped countless billions since the 1930s—have all done poorly, whereas unprotected and unsubsidised new crops—such as soya beans—have flourished. The lesson is clear: policies that pay old industries to hold on to redundant people can only do harm. Whatever money is being spent should instead go on subsidising older laid-off workers, and retraining and redeploying younger ones."