The document discusses the mortgage market meltdown caused by loose lending standards and risky mortgage-backed securities. Subprime and Alt-A loans accounted for 40-70% of loans in 2005-06 but delinquencies rose as borrowers could not repay. This caused investors to lose appetite for mortgage-backed securities. As a result, underwriting standards tightened, making it harder for potential homebuyers to qualify for loans. The meltdown negatively impacted the housing market through fewer buyers, rising inventory, and increased foreclosures. The document provides recommendations for real estate agents, sellers, and buyers to navigate through the difficult market conditions.