TORONTO, - Low investment returns loom in the decades ahead, spelling bad news for retirement savers and pension plan managers, according to a report released today by the C.D. Howe Institute. In "Long-Term Returns: a Reality Check for Pension Funds and Retirement Savers," authors Richard Guay and Laurence Allaire challenge widely used "optimistic" assumptions for investment returns based on historic experience, with more realistic ones using current Canadian data.