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Summary
• Models are useful simplifications to allow easy comparison
• Models are very limited– They are often based on limited information– They cannot be applied to every city– The more complex and accurate the model,
the less useful it is for a wide range of cities
Family life cycle
• Draw a line from left to right
• Left end is 0 years old; right end is death at about 85 years old
• Label where you will move house, where to, and why!