Explanation:

- Bank Rate: This is a quantitative tool. It's the interest rate at which a central bank lends to commercial banks. It influences monetary policy and the overall economy by affecting interest rates.

- Repo Rate: Another quantitative instrument. It's the rate at which central banks lend to commercial banks for short-term loans. Changes in the repo rate impact the economy by influencing borrowing costs.

- Open Market Operation: Quantitative as well. It involves the buying and selling of government securities to regulate the money supply. It directly impacts liquidity and interest rates.

- Margin Requirements: This is a qualitative tool. It involves setting the ratio of funds that must be kept with the central bank against liabilities. It influences the availability of credit without changing interest rates.