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Consumption Investment 450 300 CIAE 250 200 C 150 100 50 50 100 150 200 250 300 Real GDP The graph shows a simple economy without a government sector or a foreign sector. It shows consumption and investment (on the vertical axis) and RGDP (on horizontal axis) in billions of dollars. The desired investment level in this economy is: A. $200 billion. B. $250 billion. O C. $100 billion. D. $150 billion. E. $50 billion