What is the best indication of a more developed society?

The enhanced standard of living of the citizens is the best indication of a more developed society.

Explanation:

A number of parameters can be applied for the measurement of the development of any given society. But in order to determine whether the development has percolated down to the lowest strata of society, it is necessary to take note of the level of standard that the citizens have achieved to live their day-to-day life with. Only through the determination of standard of living of the citizens, the true picture of development would surface.