the new classical macroeconomics is almost impossible;

这样来讨论几乎是不可能的
there's no role for any kind of gap.

因为已经没有产出缺口这个概念了
It's much like discussing epicycles with a modern astronomer.

这就像和现代的天文学家讨论本轮一样
Even within a Keynesian tradition,

即使是在凯恩斯主义的传统框架当中
the accepted versions of the Keynesian model

被广泛接受的凯恩斯主义模型
greatly circumscribe the scope for what was Art's major concern:

也极大地限制了亚特所提出问题的范围
underemployment and the output gap.

即不充分就业和产出缺口问题
If one thinks about the centerpiece

如果有人回顾一下任意的
of the supply side of any macroeconomic model,

宏观经济模型供应方面的核心观点
almost any macroeconomic model post 1980,

我们就会发现 80年之后几乎所有的模型
in some form or other

不论以何种形式存在
it has the implication that the change in inflation

都指出通货膨胀的变化