Demography:
Thomas Malthus studied the natural history of population growth. He stated that population was rising faster than food production and freighted global starvation. He proposed that, Population grows geometrically (1, 2, 4, 8) instead of arithmetically (1, 2, 3, 4). The field of compiling, collecting, and presenting information concerning population is termed as demography, and the people busy in this work are termed as demographers.Demographic statistics: TerminologiesFertility is the real production of offspring.
Birthrate is the total number of births in a year per thousand persons.
The total fertility rate is the total number of children born to a common woman in a population during her whole reproductive life.
The Zero Population Growth Rate (i.e., ZPG) is the number of births by which people are merely substituting themselves.
Mortality or death rates are the total number of deaths per thousand persons in any specified year.
Growth ratesDeath rate subtracted from birthrate provides the natural raise of a population.
The total growth rate involves immigration and emigration, and also births and deaths.Life span and Life expectancy:
Life span is the oldest age to which a species is identified to survive.
Life expectancy is the usual age that a newborn infant can expect to achieve in any specified society.
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