The article discusses how the G7 and G20 groups work together to govern global affairs. They use a new idea called "complementary multilateralism" to show how these groups help each other. The G7 focuses on non-economic issues with the United Nations, while the G20 deals more with economic matters with Bretton Woods institutions. By working together, they can make better decisions on global health, taxes, climate change, debt, and improving the International Monetary Fund.