Answer: both fiscal policy and monetary policy.

## Explanation The regulation of economic activity over time involves managing the overall economic performance, controlling inflation, promoting growth, and stabilizing business cycles. This regulation is achieved through: **Fiscal Policy**: Government's use of taxation and spending to influence the economy. This includes: - Adjusting tax rates - Changing government spending levels - Implementing stimulus packages - Managing budget deficits/surpluses **Monetary Policy**: Central bank's control of money supply and interest rates to influence economic activity. This includes: - Setting interest rates - Controlling money supply - Managing inflation targets - Implementing quantitative easing Both policies work together to regulate economic activity: 1. **Short-term stabilization**: Addressing business cycle fluctuations 2. **Long-term growth**: Promoting sustainable economic expansion 3. **Price stability**: Controlling inflation 4. **Employment**: Maintaining optimal employment levels **Why not A or B?** - **Option A (fiscal policy only)**: Too narrow - ignores the crucial role of monetary policy - **Option B (monetary policy only)**: Too narrow - ignores fiscal policy's direct impact on aggregate demand **Correct Answer**: C - Both fiscal policy and monetary policy work in tandem to regulate economic activity over time through different but complementary mechanisms.

Author: LeetQuiz .