According to John Maynard Keynes, when government invests one billion dollars into the economy what should occur? (Standard 4.3) The one billion dollars will have an impact greater than one billion dollars due to the multiplier effect. Consumer spending should decrease by one billion dollars. O I have no idea what the answer is. The government should adjust the tax levels in order to gain addition funds to pay for the investment. The government's action should slow down economic activity