2008年-世界发展银行全球_The_Sub_Prime_Crisis___Implications_for_Emerging_Markets_46页_316kb

The Sub Prime Crisis: Implications for Emerging Markets

Core Content

This paper examines the U.S. subprime mortgage crisis and its implications for emerging markets. It highlights the key characteristics of the U.S. subprime boom and bust, contrasts them with the situation in emerging markets, and offers policy recommendations for sustainable housing finance systems.

Main Points

U.S. Subprime Mortgage Boom and Bust

• Excessive optimism led to ballooning property prices and aggressive lending over a decade, with national average house prices rising by 53–86% between the mid-1990s and 2006.
• Mortgage originations increased fivefold, peaking at $3.9 trillion in 2003.
• Subprime ARMs underperformed other loan types, with serious delinquencies rising sharply from 5.68% in 2005 to 14.44% in 2007.
• Weak underwriting was a primary cause of defaults, especially in non-bank lenders who prioritized secondary market sales over borrower capacity.
• High LTV and DTI ratios were common, with stated income loans (also called "no doc" or "liar loans") becoming widespread. These loans had spreads of up to 500 basis points above prime rates.
• Prepayment penalties and geographic concentration of subprime lending contributed to loss severity and default cascades.

Emerging Markets and Mortgage Lending

• In most emerging markets, mortgage finance is a luxury, typically accessible only to upper income households.
• Policy makers should aim to expand access to lower and moderate income households, but with careful regulation and diverse financing methods.
• Securitization can be a useful tool, but only if incentives and oversight are aligned.
• Stated income loans and high LTV loans are riskier and should be used cautiously, especially in markets where house price stability is not assured.

Policy Recommendations

• Adopt a variety of financing methods to ensure accessibility and sustainability.
• Allow rental or purchase based on financial capacity of households.
• Improve underwriting standards and risk assessment to avoid repeating the mistakes of the subprime crisis.
• Encourage the use of mortgage insurance to mitigate credit risk for lower income borrowers.
• Monitor and regulate the use of high LTV and stated income loans to prevent overleveraging and financial instability.

Key Information

• Subprime ARMs had serious delinquencies that almost tripled between 2005 and 2007, with FHA ARMs performing better than subprime ones.
• Piggyback loans allowed for 100% financing of house prices, but increased debt burdens and negative equity risks, especially with falling house prices.
• Credit scoring and financial liberalization played a key role in expanding access to credit in the U.S., but also contributed to risk.
• Tax subsidies for home ownership were regressive, benefiting higher income households more than lower income ones.
• Mortgage insurance (MI) was important in mitigating risk and supporting access to finance for lower income borrowers, but market share declined during the subprime boom.

Conclusion

The paper concludes that it is possible to extend mortgage lending to lower and moderate income households without repeating the subprime crisis, provided that sound underwriting, effective risk management, and diverse financing options are implemented. Emerging markets should take caution in adopting similar practices and ensure that policies are aligned with local economic conditions and financial stability.