昨日紹介したメンジー・チンのエントリに、デビッド・ベックワースが以下のようなコメントを寄せていた。 Menzie: Something that I wrestle with is the question of whether all output gaps (assuming they are measured correctly) are the same. Let me explain. Let's say there is a negative output gap. If it were created by a negative AD shock then it then the notion of an output gap as it is normally used makes senses (i.e. policy should aim to close the ga