The bottom line with Krugman's analysis is that he believes that current expenditures must be subsidized with negative interest rates if aggregate demand is to increase.

克鲁格曼分析的底线是他认为如果累计总需求增加，经常支出必须要通过负利率来补贴。

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This is because the basic analysis is that an increase in the budget deficit provides a fiscal boost to aggregate demand.

FORBES: Payroll Tax Reductions as Fiscal Stimulus