Is a comparison between those individuals whom society considers economically productive and those it considers economically unproductive.

Dependency ratio, is the right answer.

Explanation:

The term dependency ratio is used to describe an age-population ratio of those who provide their labor services and who do not. Basically, it is the ratio between those in the labor force and those who are not in the labor force. Such a ratio is used to calculate the stress on a productive population.

The concern of the dependency ratio is crucial for governments, bankers, economists, company, firms, colleges and all other significant economic divisions which can avail from experiencing the consequences of changes in population formation.

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