The active flotation of mortgage-backed securities and securities backed by loans to businesses is likely to expand the size of Japan's "structured finance market" to 5 trillion yen in 2002, a U.S. credit-rating agency has said.

The securitization market is expected to receive ammunition especially from active issues of two types of sophisticated securities -- residential mortgage-backed securities and cash flow and synthetic collateralized debt obligation (CDO), Standard & Poor's Corp. said Monday.

Growth in commercial mortgage-backed securities issuance is also expected to be strong, the agency said.