A start-up is working to allow retirees and other individual investors to buy into non-qualified mortgages, a market that so far has been dominated by hedge funds and other large institutional investors, along with occasional inclusion in non-agency mortgage-backed securities. Brad Walker, CEO of Income&, said the new platform offers an alternative to traditional fixed-income investments. He said Income& is trying to create a higher-yielding, lower-risk fixed-income instrument ...