The article explores how monetary policy affects stock prices in different countries from 1999 to 2017. By using a special model, the researchers found that in many countries, changes in interest rates don't always directly impact stock prices in the long term. Each country reacts differently to monetary policy changes, and the US has a big influence on global economic conditions. When central banks make money easier to get, stock prices tend to go up in countries with weak monetary systems. But when stock prices change, central banks don't always respond. Overall, the US doesn't have a big impact on stock prices in most countries.