By Emile Hallez Source: Investment News A pension research group has a message for employers: The switch from defined-benefit plans to 401(k)s has made retirement saving more expensive. That conclusion takes into account the costs borne by both employers and employees. Switching to a defined-contribution plan can of course save companies money, but the overall cost of the benefit increases, according to the National Institute on Retirement Security. The nonprofit this month published its third iteration of a paper [...]