MYP Individuals & Societies Population Growth Notes

What Is Population Growth Driven By?

1. At any scale (a city, a country, or the world), three processes drive this change:
   1. Births (adding people)
   2. Deaths (removing people)
   3. Migration (moving people into or out of a place)
2. Although the world population grew slowly for most of human history, it has risen rapidly in recent centuries and was about 7.5 billion at the time of the source text.
3. Crucially, growth is uneven: different regions and countries experience different rates and different consequences.

How Do Population Measures Let You Describe And Compare Places?

1. To understand why populations grow at different speeds, geographers and social scientists use a set of standard measures.
2. These indicators help describe population change and support predictions and planning.

Why Birth Rate and TFR aren't the same

1. A birth rate counts births against the entire population, including many people who can't have children like men, children, and older adults.
2. This makes it useful for quick, headline comparisons, but less helpful for understanding how many children families actually have.
3. Total fertility rate (TFR) on the other hand looks only at women of child-bearing age and estimates the average number of children per woman over her lifetime.
4. Because it focuses on those who can give birth, TFR gives a clearer picture of family size and is a better indicator of long-term population change.

How Is Natural Increase Calculated?

1. Natural increase begins as a difference "per 1,000 people."
2. It's often converted into a percentage growth rate so it can be compared more easily between places and over time.