Practice question · Match the pairs
Match each pyramid shape to its demographic meaning.
- Wide-based triangle
- Barrel / column
- Inverted base (narrow bottom)
- Bulge in middle ages
- Stable, aging population (stage 4)
- A baby boom moving through time
- Shrinking birth cohorts
- Young, fast-growing population (stage 2)
Hints
- Each band is a birth cohort moving upward over time.
- A wide base and a narrow one forecast opposite futures.
Show the answer
- Wide-based triangle → Young, fast-growing population (stage 2)
- Barrel / column → Stable, aging population (stage 4)
- Inverted base (narrow bottom) → Shrinking birth cohorts
- Bulge in middle ages → A baby boom moving through time
Why
A pyramid is a time machine: each band is a birth cohort marching upward at one year per year. Today’s bulge is 2050’s pension bill, already visible.
Practise Population and Urbanization
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