The provisions intended to have the swiftest impact are the tax cuts, totaling $275 billion, roughly a third of the package.
Republicans say the cuts are too small, some Democrats say they were ill designed in a vain effort to appease House Republicans, and some economists say both sides are right: that the plan should include more effective tax cuts and more of them, and also address specific problems like the weak housing market.
Mr. Obama’s signature tax cut would provide a credit of up to $500 for individuals and $1,000 for couples. It won praise in an analysis by the Tax Policy Center, a nonpartisan research group, because it could be carried out quickly, by reducing the amount of money withheld from paychecks.
But the same group also criticized it because it would help families earning as much as $150,000 a year, who are more likely to save than spend. (Saving, or paying off debt, might make sense for individual households, but what the economy needs most is for people to spend money, helping stores to sell more, factories to produce more and employers to avoid cutting additional jobs.)
Some experts say adjusting withholding rates could prove complicated, delaying the money. But the White House says the plan would work even better than a lump-sum rebate; some research suggests that rebate checks are more likely to be saved than tax reductions spread out over a length of time.
Even some economists who generally support the stimulus think that the main tax proposal would provide limited economic lift.
“People are going to spend 30, 40 cents on the dollar, so the multiplier is going to be low,” said Adam S. Posen, deputy director of the Peterson Institute of International Economics.
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