The impact of changes in monetary policy on global markets is a vital topic for understanding the world economy. Monetary policy, which includes setting interest rates, the money supply, and other actions by central banks, affects liquidity and economic stability. Changes in interest rates are one of the main instruments of monetary policy. When central banks raise interest rates, borrowing costs will increase. This often reduces corporate investment and consumer spending, which can then suppress economic growth in the short term. In global markets, rising interest rates in large countries such as the United States usually cause the US dollar to strengthen. Investors tend to shift to assets that are considered safer with higher yields, resulting in a diversion of capital from developing countries. Conversely, when the central bank lowers interest rates, liquidity increases and drives economic growth. This can encourage the flow of foreign investment to countries that offer lower interest rates, thereby lowering the value of the local currency. Developing countries are often more vulnerable to changes in monetary policy than developed countries, which can result in volatility in currency markets and stock exchanges. Inflation is also a key factor in the impact of monetary policy. If inflation rises in a country, the central bank tends to increase interest rates to stabilize it. This not only affects the domestic market but also has global implications. Countries that rely on exports will feel a significant impact if their production costs increase due to tight monetary policy. Interaction between countries in trade is also greatly affected. Tight monetary policies in developed countries can reduce demand from developing countries, affecting commodity prices. When global demand declines, commodity producing countries such as Brazil or Indonesia will feel a direct impact on their export revenues. Political and economic uncertainty also plays an important role. Investments may be affected by monetary policy uncertainty, which may trigger cautious decision-making by companies. When investors doubt the stability of policies, capital can shift to more stable assets, such as gold or government bonds. Lastly, the impact of monetary policy has the potential to produce a domino effect. Policies taken by one country can trigger similar responses in other countries. This further strengthens dependence on the global market. Countries that have strong trade relations will really feel the impact, both positive and negative. It is important to monitor the monetary policies of major countries and how global markets respond to optimizing growth. Effective monetary policy must be in harmony with domestic and global economic conditions to minimize negative impacts and exploit growth potential.