3. In a four-sector Keynesian income-expenditure (or multiplier) model for an open economy an increase in government expenditure will cause I. b. an increase in consumption. an interns: in saving and a Worsening of the trade balance an increase in consumption. a decrease in saving and a worsening of the trade balm an immase in consumption. an increase in saving and an improvement in the trade balance an increase in consumption. a decrease in saving and an improvement in the trade Manet