Population. By: Rebecca Marty. Formula for Population. Actual rate of population change can be determine by an Formula: Actual Growth rate (%) = birth rate- death rate divided by 10
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Actual rate of population change can be determine by an Formula:
Actual Growth rate (%) = birth rate- death rate divided by 10
Ex. The United states had a birth rate of 14.6 live births per 1,000 population in one year. The death rate in that year for the United States was 8.3 deaths per 1,000 population. Calculate the Population Growth rate (%) for the United States in that year.
The world’s population is still growing quickly. This growth is due to nations with above-replacement TFRs and a population momentum caused by large numbers of younger females who have as yet not had children.
Declines in fertility rates can be attributed to several factors. Urbanization results in a higher cost of living. Urbanization reduces the need for extra children to work on farms.
There is a greater personal acceptance and government encouragement of contraception and abortion. The numbers of females in the workforce and female educational opportunities are increasing. More individuals desire to increase their standard living by having less children.
The two main effects of TFRs less than 2.1 without additions through immigration are population decline and population aging.
Demographic Transition- refers to the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system. Or is a model that describes population change over time.
There are 4 stages:
Stage 1: Pre modern- is associated with pre modern times, and is characterized by a balance between birth rates and death rates.
Stage 2: Urbanizing/Industrializing- sees a rise in population caused by a decline in the death rate while birth rate remains high, or perhaps even rises slightly.
Stage 3: Mature Industrial – moves the population towards stability through a decline in one birth rate.
Stage 4: Post Industrial – is characterized by stability in this stage the population age structure has become older.
A good indicator of future trends in population growth is furnished by age-structure diagrams. Age structure diagrams are determined by birth rate, generation time, death rate, and sex ratios.
When the Base is large ( greater number of individuals in the population), there is a potential for an increase in the population as these younger individuals mature and have children of their own (population momentum).
When the top of the pyramid is larger, it indicates a large segment of the population is past their reproductive years and indicates a future slowdown in population growth.