The investment schedule is downward sloping and the saving schedule is upward sloping with respect to the interest rate. Suppose the equilibrium real investment per year at the market rate of interest is $1 trillion
How is this represented when real national income per year is on the horizontal axis? How is this incorporated into the consumption-function graph?
Investment spending is a function of the interest rate, but it is autonomous with respect to real Gross Domestic Product (GDP). So the investment function is a horizontal line at $1 trillion when real Gross Domestic Product (GDP) per year is on the horizontal axis. The C + I curve is found by vertically summing the upward sloping consumption curve with the horizontal investment curve. The C + I curve slopes up and is always $1 trillion higher than the C curve.
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