Which country controls the world economy?

Could you please elaborate on the notion that a single country controls the world economy? It's a complex and multifaceted system involving numerous nations, economic blocs, and global institutions like the International Monetary Fund (IMF) and the World Bank. Additionally, the influence of various economies, such as the United States, China, and the European Union, cannot be overlooked. So, is there a specific country that exerts dominance over the global economy, or is it a more collaborative and interconnected effort?