More than $1.6 trillion has been erased from U.S. equities since Jan. 20 as mounting bank losses and rising unemployment convinced investors the recession is getting worse.
Let us say that 50 percent of the loss in wealth reflects the market's reaction to the stimulus plan. That would be $800 billion. A standard assumption is that the marginal propensity to consume out of wealth is 5 percent. That would mean $40 billion less in spending. Then there is the effect on investment of the drop in Tobin's q (the ratio of the market value of capital, reflected in stock prices, to the cost of capital goods). These effects kick in immediately, while much of the stimulus will not kick in until next year. So is the multiplier for the stimulus positive or negative?
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