A former presidential economic advisor is questioning the government's proposal to lower corporate income tax rates. Kim Jong-in called it a premature move lacking effectiveness. Kim said the government seems to have put forward the tax cut plan to try to turn around the slumping economy. But he said one-percent reduction in the corporate tax rate would not spur facility investments immediately and that Korea's corporate tax rates are not high compared to other countries. He was a guest on a radio show Wednesday.