The figure shows an economy operating at a real GDP of Y1 and a price level of P1, at the intersection of AD1 and SRAS1. 1) What kind of gap is the economy experiencing? 2) What type of monetary policy (expansionary or contractionary) would be appropriate for closing the gap? 3) If the Central Bank decided to pursue this policy, what type of open-market operations would it conduct? 4) How would interest rates and investment change? 5) How would the aggregate demand curve shift?