Watch the first video. A mobile location data company visualizes the network effect of travelers to one beach. You can see where the people traveled too after being at the beach. Pretty good way to see how things can grow exponentially based in travel. Again, this is just one beach on Florida.
https://www.cltampa.com/news-views/...all-travelled-during-the-coronavirus-outbreak
https://www.cltampa.com/news-views/...all-travelled-during-the-coronavirus-outbreak