TORONTO, - The costs of public sector investments in infrastructure projects are underestimated and should include the risks to taxpayers who backstop them, according to a report released today by the C.D. Howe Institute. In " The Valuation of Public Projects: Risks, Cost of Financing and Cost of Capital," authors Marcel Boyer, Eric Gravel and Sandy Mokbel find current evaluations of public projects suffer from serious flaws, exposing taxpayers to unaccounted-for risks and bad investment decisions.