TORONTO, - Postsecondary tax credits cost the federal and provincial governments billions of dollars each year, but are not distributed equitably and may have no proven effect in boosting enrolment, according to a report released today by the C.D. Howe Institute. In "What You Don't Know Can't Help You: Lessons of Behavioural Economics for Tax-Based Student Aid," author Christine Neill finds flaws in the design of postsecondary tax credits and recommends they be better-targeted at low-income families that need them most.