Final answer:
Expansionary monetary policy lowers interest rates and stimulates borrowing to increase aggregate demand in the economy.
Step-by-step explanation:
A monetary policy that lowers interest rates and stimulates borrowing is an expansionary monetary policy or loose monetary policy. Conversely, a monetary policy that raises interest rates and reduces borrowing in the economy is a contractionary monetary policy or tight monetary policy. The Federal Reserve uses expansionary monetary policy to increase aggregate demand and stimulate economic growth.