Monetary policy is a process for the monetary authority of a country to control the supply of money. In conventional financial system, there are usually 3 tools for the monetary policy, which are: (1) open market operations, (2) reserve requirements and (3) discount rate. Discuss whether the above monetary policy tools are in line with the Shariah. Is there any Shariah-compliant instrument if the above-mentioned tools are not Shariah-compliant?