The biggest losers in National's bid to super size Kiwisaver are low income earners and small businesses according to an economics expert. If re-elected National is proposing to raise Kiwisaver contributions to a combined 12 percent by 2032. The graduated increase would see contributions split evenly between between the employer and the employee, topping out at six percent each. Professor of economics Robert MacCulloch, who holds the Matthew S. Abel Chair of Macroeconomics at the University of Auckland, spoke to Lisa Owen.