Dependency ratio: the ratio between those of working age and those of non-working age. This is calculated as:
% pop aged 0 -14 + % pop aged 65+
% of population aged 15-65
x 100
The ratio for an MEDC usually lies between 50 and 75. The ratio for an LEDC is typically higher. Mexico, with a youthful population structure, has a dependency ratio of 104. The higher the ratio, the greater the number of dependents that have to be provided for from the taxes on the workforce.