lag不应该是存在新古典中吗

问题如下：

Monetarists favor a limited role for the government because they argue:

选项：

A.

government policies operate with a lag.

B.

firms take time to adjust to systemic shocks to the economy.

C.

resource use is efficient with marginal revenue and cost equal.

解释：

A is correct.

Monetarists caution policy effects can occur long after the need for which they were implemented is no longer an issue.

考点：Monetarists

解析：因为政府制定的政策存在时滞，可能等到政策开始起效时候，经济已经自行恢复了，所以货币学派不建议政府扮演干预经济的角色。A选项正确。

本题考察的主体是政府，不是企业，所以C选项不入选。