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Geography (155)
GEOG 1280 (81)
Lecture 56

# GEOG 1280 Lecture 56: Lecture 56 Premium

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School
Department
Geography
Course
GEOG 1280
Professor
Bruce G.Erickson
Semester
Summer

Description
Oc78 Problem: our lack of understanding the exponential function. Exponential Growth Occurs when the growth rate of a mathematical function is proportional to the funcitons current value. Doubling Time (Rule of 70) The amount of time required to double the number of a growing phenomena. We calculate the doubling time, T2 = 70 growth per unit time A growth rate of 5 per year would have a doubling time of 14 years. Thomas Malthus An essay on the principle of populaiton (1798) Assumption: food supply can be increased only arithmetically, whereas population has th epotential to increase geometrically. Eventually you have people without the resources to survive. Demographic Transition The change fom high fertility and high mortality to low fertility and low mortality Population Pyramids Is an age structure diagram, that shows the distribution of various age groups (cohorts) Dependency Ration:
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