The underlying assumption of the model displayed in the image is;
The city will grow fast to serve a given area
What is Multiple Nuclei Model?
The given map shows a multiple nuclei model.
Now, A Multiple-Nuclei Model city is one that does not have one central area, but instead has several nodes that act as regional centers for economic or residential activity within one larger city.
From the given model we can see that it is truly a multiple nuclei model city because it doesn't have a central area but has many areas that can serve as that as we see that there is even an industrial suburb at the periphery of the city and also a heavy manufacturing area down south of it.
Thus, we can conclude that the city will grow fast to serve any given area where it is required.
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