Which international body monitors financial and economic developments and cooperation among nations?

International monetary fund

Explanation:

International monetary fund is an America based international organization established to monitor and foster financial and economic development and cooperation among nations through policies advice, economic surveillance and training

It is made up of three functions namely overseeing economic development, lending and capacity development.

To achieve its aim, it also give loans to member nations who are going through economic crisis.

There are three major institutions that work on a global financial stage. The International Monetary Fund (IMF) says that it "an organization of 188 countries, working to foster global monetary cooperation, secure financial stability, facilitate international trade, promote high employment and sustainable economic growth, and reduce poverty around the world."