Final answer:
An expansionary monetary policy shifts the supply curve to the right and reduces the interest rate, while a contractionary monetary policy shifts the supply curve to the left and increases the interest rate.
Step-by-step explanation:
An expansionary monetary policy occurs when the central bank increases the money supply or lowers interest rates to stimulate economic growth. In the market for loanable funds, this policy will shift the supply curve to the right, from the original supply curve (So) to the new supply curve (S1). As a result, the equilibrium interest rate will decrease from 8% to 6% and the quantity of funds loaned will increase from $10 billion to $14 billion.
Conversely, a contractionary monetary policy occurs when the central bank decreases the money supply or raises interest rates to control inflation. In the market for loanable funds, this policy will shift the supply curve to the left, from the original supply curve (So) to the new supply curve (S2). Consequently, the equilibrium interest rate will increase from 8% to 10% and the quantity of funds loaned will decrease from $10 billion to $8 billion.