kindly explain in details

3. How do representative and credit monies compare to commodity monies?

4. Define barter and explain why it is economically inefficient?

5. Explain how monetary policy, fiscal policy and international measures can be used to control trade cycles?

6. For decades, the Federal Reserve (Central bank of US) capped the interest rates that banks could pay on checking deposits at zero and the interest rates that they could pay on time or savings deposits at around 6 percent per year. What was the intended economic effect of those restrictions?