The definition of dependency ratio is the percentage of dependents in the total population. This includes children from infants to 14 years and seniors who are above 65 years f age.
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"The dependency ratio is used in Economics to measure the working population and non working population. It is age-population ration, and takes into account both dependents and productive populations."
The ratio of output to input of a system or process.
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yes because a ratio is a rate so a rate would have to be a ratio