But the same basic framework could be used by starting with a higher cap and gradually reducing it over several years. A 5% cap on the tax-expenditure benefits would raise only $75 billion in 2013, about 0.5% of GDP; but the cap could be reduced from 5% to 2% over the next few years, raising substantially more revenue when the economy is stronger.
2013年的1 500亿美元额外收入将相当于GDP的1%，美国经济还吞不下如此巨额的数量，特别是如果还要加上政府支出削减和工资税增加的话。但相同的基本框架可以通过设置更高的起始限制并在多年内逐渐调低实现。5%的收入支出收益限制将在2013年形成750亿美元的额外收入，约相当于GDP的1%；但该限制可以在未来几年里降至2%，在经济更加坚挺时形成多得多的收入。