についてデロング、クルーグマン、ディーン・ベーカーが三者三様の考察を示している。 ●デロング Commercial banks need a wedge of about 300 basis points between their cost of funds and the returns on the loans they make. ...Commercial banks have a hard time making their business model work when the Federal Reserve target and the market expected inflation rate is, say, 2% per year. They would have a much easier time making their business model wor