Hi, I wonder whether it is acceptable if I only use relative income as the measure of poverty?

Add oil!

Sounds reasonable.

It is recommended that you find a better way. Although income is used widely as the poverty indicator internationally, there are important limitations to using income alone to assess the well-being of the working poor. First, poverty is multidimensional in nature, and the full picture cannot be captured by income level alone. Second, income is only a proxy measure of an individual’s well-being. Other factors, such as the cost of living and an individual’s capacity to source from other means to meet one’s needs, may modulate the effect of income on that person’s well-being.