Debt-securitization markets continue to face significant challenges, with some operating solely because of government support. Industry analysts said the Federal Reserve is buying as much as 85% of government-guaranteed mortgage-backed securities. "This is public support," said George Miller, executive director of the American Securitization Forum. "At the end of the day, the mortgage risk is held by the taxpayer." Issues in the markets might hinder economic recovery because they have been a substantial source of credit in recent years. Fed policymakers are betting that investors will return to securitization markets as they warn that support is about to be carefully withdrawn.