Final answer:
Almost half of the world's population resides in middle-income countries, which are key markets with opportunities for global businesses due to their vast customer bases and growing connection to technology and global markets.
Step-by-step explanation:
Global marketers should take note that almost half of the world's population is located in middle-income countries. These countries have per capita incomes ranging between $1,025 and $12,475, accounting for 69.5% of the global population. By focusing resources and marketing efforts in these regions, businesses can potentially tap into vast customer bases that are increasingly connecting to technology and global markets, and experience growth due to increases in human capital and innovation.