Demographic transition model

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Dr.Qball

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Hello everyone I seem to come upon two different explanations on the Khan academy 300 word document regarding the same thing. Screenshot 2017-01-04 at 4.24.55 PM.png Screenshot 2017-01-04 at 4.24.55 PM.png Screenshot 2017-01-04 at 4.26.58 PM.png
I always thought Stage 1 was expanding population but in the first picture is says stationary pyramid. Thinking about it, it makes sense that the population is stable since both high birth rates and death rates are means a relatively equal population but then why is it considered expanding?

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