Population Distribution and Density Concepts

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Population Distribution and Density: Arithmetic Density

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Total population divided by total land area

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Population Distribution and Density: Physiological Density

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Population divided by arable land

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Population Distribution and Density: Agricultural Density

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Farmers divided by arable land

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Population Pyramids: Wide Base

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Indicates a high birth rate (Stage 2)

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Population Pyramids: Narrow Base

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Indicates a low birth rate (Stage 4/5)

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Population Pyramids: Irregularities

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Can indicate wars, booms, or government policies

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Demographic Transition Model (DTM): Stage 1

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High birth rate, high death rate, low natural increase; Pre-industrial, famine, disease

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Demographic Transition Model (DTM): Stage 2

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High birth rate, rapidly declining death rate, high natural increase; Industrial revolution, medicine

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Crude Birth Rate (CBR) and Crude Death Rate (CDR)

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Measures of population growth; CBR is the number of births per 1,000 people per year, and CDR is the number of deaths per 1,000 people per year.

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Natural Rate of Increase (NRI)

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Calculated as CBR minus CDR; indicates population growth rate.