Final answer:
The alternative to analyzing buying power across countries is through socioeconomic strata analysis (SES), which factors in income, purchasing power, and wealth to assess global stratification.
Step-by-step explanation:
Another alternative to analyze buying power in a set of countries is via socioeconomic strata analysis (SES). This approach examines income, purchasing power, and wealth to calculate global stratification, which compares the quality of life a country's population can have. It considers factors such as geography, demography, industrial structure, and institutions that contribute to the differences in economic statistics and well-being. Therefore, the correct answer is d. socioeconomic strata analysis (SES).