Regional differences in socioeconomic trends: The spatiotemporal evolution from individual cities to a megacity region over a long time series.

However, the lengths of the long and short axes of the GDP pattern SDE show an increasing trend that is the opposite of the population pattern, indicating that the economy of the GBA expanded from 2000 to 2018 but that the population was more concentrated during that time.

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The overall movement of the total retail sales gravity center is similar to that of the GDP gravity center; additionally, it shows a clear trend toward the northwest.

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Therefore, a significant trend in population growth is not observed.

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