The world is getting richer. The global economy expanded by more than 3% to $80.68 trillion in 2017. The world's wealth is not distributed equally. North America, home to less than than 5% of the global population, accounts for about one-fourth of global economic output. Meanwhile, in South Asia, where nearly 25% of the world's population resides, the region's economic activity accounts for less than 4% of global gross domestic product.