Warm-up Objective - Today, students will be able to know what a population pyramid is and what we can learn from their different shapes. On a sheet of notebook paper, please answer the following. –What is CBR? (definition, not just what the acronym stands for.) –What is CDR? –What is TFR?

Population Pyramids

What is a population pyramid? A visual representation of the population of a country. graphically display a population's age and gender composition show numbers or proportions of males and females in each age group show gains of members due to immigration and birth, and loss of members due to emigration and death reflect population growth or decline

Interpreting a Population Pyramid Remember that a population pyramid is basically a bar graph turned on its side. Each line is showing you what percentage of the population is a certain age. Examine the title and the type of data presented. (ex. Age breakup, numbers listed below, male-female notation.)

How to interpret population pyramids There main types of pyramids –Rapid growth –Slow growth –Negative growth Shape of rapid growth Shape of Slow growth Shape of negative growth

Rapid growth

Rapid growth pyramids Have a large base to show high birth rates Amount of people decreases as the ages goes up indicating a lower standard of living Associated with developing countries like Brazil, Uganda, China

Slow Growth

Slow growth pyramids Take on a more rectangular shape Indicates population is remaining fairly steady Birth rates and death rates are similar Associated with developed countries like the UK, Germany, Canada

Negative growth

Negative growth pyramids Looks like a reverse pyramid Indicates the population of the country is decreasing Death rates are higher than birth rates Associated with developed countries like Austria, Japan, Italy

Dependency Ratio The number of people under the age of 15 and over the age of 64 compared to the number of people active in the labor force Q: What are some of the issues with having a “too young” pop? Issues with a “too old” pop?

Dependency Ratio Problems Too Young: LDC/Stage 1/2 Nearly ½ of the pop in LDCs are dependents Provide: schools, hospital, daycares-> if girls don’t go to school the TFR/CBR remain high Too Old: MDC/Stage 3/4 1/3 pop in MDCs are dependents $$ after retirement, medicine 25% of budget in the US and other MDCs goes to programs for the elderly

Soviet Union WWI ,700,000 military dead December 1934 Stalin began a period of purging and terror that lasted until 1939 and was marked by the execution of virtually the entire political and military elite. Enemies of the State e/countrys/europe/eur.htm

Cambodia April 17th, 1975 the Khmer Rouge, a communist guerrilla group led by Pol Pot, took power in Phnom Penh, the capital of Cambodia. During their rule, it is estimated that 2 million Cambodians died by starvation, torture or execution.

Poland During World War II 6 million Poles (about one sixth of the population) died, including nearly 3 million Polish Jews murdered in Nazi death camps m_auschwitz/ b.html