Suppose the Fed buys $400 worth of Treasury Securities from commercial banks. How would that transaction affect the balance sheet of the commercial banks? Commercial banks' Treasury Securities would fall by $400 and their Reserves would rise by $400. Commercial banks' Treasury Securities would fall by $200 and their Reserves would rise by $400. Commercial banks' Treasury Securities would fall by $400 and their Reserves would rise by $200. Commercial banks’ Treasury Securities would fall by $200 and their Reserves would rise by $200.

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