Final answer:
Sociologists study economic comparisons between nations to understand global stratification. This helps identify worldwide inequalities and variations in poverty levels across countries.
Step-by-step explanation:
Sociologists studying global stratification analyze economic comparisons between nations. Income, purchasing power, and wealth are used to calculate global stratification. Global stratification also compares the quality of life that a country's population can have. Poverty levels have been shown to vary greatly across countries. Yet all countries struggle to support the lower classes.