Age Structure - • The birth rate is low, hence the low...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Age Structure There are 3 basic age structures: 1. Progressive (Brazilian) Type 2. Stationery (American) Type 3. Regressive (European) Type Progressive Type It has a wide base that quickly narrows upwards to a point. It indicates a large birth rate, but poor conditions mean people rapidly die off, hence the triangular shape of the structure. The population is increasing. Stationery Type The shape of this structure is more "square." All age roups are well represented. It indicates that the birth rate is moderate, and few people die off as they get older. The population is stagnant. Regressive Type The structure has a fairly wide top with a bulging middle and narrow base.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • The birth rate is low, hence the low base, and there are more adults than children. The population is decreasing. The Dependency Ratio • This is the ratio between the non-working population (children and aged) and the workers (adults). • It is lowest in regressive populations and highest in progressive populations. • It is calculated using the formula (children + aged)/Adults) * 100 • In developed countries, the DRs range from 50-70. In most developing countries the DRs are over 100 The Old Age Index • This is the proportion of aged to adults. • It is calculated using the formula: (aged)/(adults) * 100...
View Full Document

This note was uploaded on 11/10/2011 for the course GEA GEA2000 taught by Professor Wong,faith during the Fall '09 term at Broward College.

Ask a homework question - tutors are online