Final answer:
The Fed's open market purchase of Treasury bonds from Acme Bank will increase the bank's reserves and decrease its bonds by $10 million. Acme Bank can, in turn, lend out these new reserves, thereby increasing loans and potentially influencing the economy as part of the Fed's monetary policy.
Step-by-step explanation:
When the Federal Reserve conducts an open market purchase by buying Treasury bonds from a bank, it increases the bank's reserves. In the scenario with Acme Bank, the initial balance sheet shows, under assets, reserves at $30 million, bonds at $50 million, and loans at $50 million. The liabilities show deposits at $100 million and equity at $30 million.
After the Fed purchases $10 million in Treasury bonds from Acme Bank, Acme's reserves increase by $10 million since they receive cash for the bonds. The bonds held by the bank decrease by $10 million on the assets side. In turn, Acme Bank can use this increase in reserves to extend new loans.
This operation is a part of the monetary policy tools used by the Fed to manage liquidity in the banking system and influence the overall economy.