So Bernstein is sticking to the prediction that unemployment will be substantially lower with the stimulus bill than without. On that point there's good economic theory to support him. Last October, for example, Republican economist Martin Feldstein, who had been Ronald Reagan's chief economic adviser, wrote in the Washington Post: "The only way to prevent a deepening recession will be a temporary program of increased government spending." He argued for a package in the hundreds of billions of dollars. Later Feldstein wrote that the package Congress was considering was "a mistake" and said it should concentrate more on military spending and temporary tax credits for such things as home improvements and buying automobiles. But he added: "The problem with the current stimulus plan is not that it is too big."