在房地产信贷泡沫形成的同时，一系列因素使得金融体系日益脆弱。政策制定者不承认金融机构，如投资银行和对冲基金所扮演的日益重要的角色，也被称为影子银行系统。一些专家认为，这些机构在向美国经济提供信贷方面与商业银行（存款银行）一样重要，但它们没有受到同样的规定。这些机构以及某些受管制的银行在提供上述贷款时也承担了沉重的债务负担，没有足够的资金缓冲来吸收大量贷款违约或抵押贷款证券化损失。这些损失影响了金融机构放贷的能力，减缓了经济活动。对主要金融机构稳定的关切促使各国央行采取行动，提供资金，鼓励放贷，恢复对商业票据市场的信心，这对商业运作是不可或缺的。政府还对主要金融机构进行了纾困，并承担了额外的财政承诺。
英国统计学论文代写:政策制定者
While the housing and credit bubbles built, a series of factors caused the financial system to become increasingly fragile. Policymakers did not recognize the increasingly important role played by financial institutions such as investment banks and hedge funds, also known as the shadow banking system. Some experts believe these institutions had become as important as commercial (depository) banks in providing credit to the U.S. economy, but they were not subject to the same regulations. These institutions as well as certain regulated banks had also assumed significant debt burdens while providing the loans described above and did not have a financial cushion sufficient to absorb large loan defaults or MBS losses. These losses impacted the ability of financial institutions to lend, slowing economic activity. Concerns regarding the stability of key financial institutions drove central banks to take action to provide funds to encourage lending and to restore faith in the commercial paper markets, which are integral to funding business operations. Governments also bailed out key financial institutions, assuming significant additional financial commitments.