There are many reasons for the underpricing of risk and the rise in leverage. The exceptionally easy monetary policy at the start of the decade contributed to financial investors’ willingness to buy low-quality financial assets in order to get higher yield and to an explosive rise in house prices.
产生对风险的低估和杠杆效应运用的增加的原因是多方面的。始于本世纪初的极为宽松的货币政策推动了金融投资者购买低质量金融资产以获得更高的回报的意愿，也推动了房价的爆炸性上扬。评级机构错估了资产担保型证券的价值。