Although many banks in the U.S. and Europe simultaneously overinvested in mortgage-backed securities (MBSs) to their peril, positive feedbacks in the global economic system amplified those errors.

• 虽然欧美许多银行同时在不动产抵押担保证券（MBS）上投资过大，风险过高，但使错误进一步扩大的却是来自全球经济体系的正向反馈。