On the heels of much discussion of residents leaving New York City, San Francisco, and other major cities because of COVID-19, the Daily Mail suggests 500,000 people have left New York City:

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Parts of Manhattan, famously the ‘city that never sleeps’, have begun to resemble a ghost town since 500,000 mostly wealthy and middle-class residents fled when Covid-19 struck in March.

The number is also part of the headline.

But, how do we know this number is accurate? If there was ever a figure that required some serious triangulation, this could be it. Most of the news stories I have seen on people fleeing cities rely on real estate agents and movers who have close contact with people going from one place to another. Those articles rarely mention figures, settling for vaguer pronouncements about trends or patterns. Better data could come from sources like utility companies (presumably there would be a drop in the consumption of electricity and water), the post office (how many people have changed addresses), and more systematic analyses of real estate records.

A further point about the supposed figure: even if it is accurate, it does not reveal much about long-term trends. Again, the stories on this phenomenon have hinted that some of those people who left will never return while some do want to get back. We will not know until some time has gone by after the COVID-19 pandemic slows down or disappears. Particularly for those with resources, will they sell their New York property or will they sit on it for a while to give themselves options or in order to make sure they get a decent return on it? This may be a shocking figure now but it could turn out in a year or two to mean very little if many of those same people return to the city.

In other words, I would wait to see if this number is trustworthy and if so, what exactly it means in the future. As sociologist Joel Best cautions around numbers that seem shocking, it helps to ask good questions about where the data comes from, how accurate it is, and what it means.