Human mobility networks reveal increased segregation in large cities
95 points
1 year ago
| 4 comments
| nature.com
| HN
sinkasapa
1 year ago
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As a non-specialist, I think a surprising statement is that in this particular field, there is an expectation that large, dense cities encourage socioeconomic mixing. That seems counter to everyday experience and policies that are sometimes enacted in cities to counter the trend, like bussing kids in poor neighborhoods into richer school districts. The term "ghetto" famously describes an urban trend to cut off poor enclaves, generally with some racial or ethnic component. I guess I felt like it was "common knowledge" that urbanization increased social stratification, whether in ancient times as agricultural societies developed, as I was taught in high school social studies, or in more modern cases where people leave the land to find opportunities, as in Latin America, for instance, where terms like favela are familiar even to English speakers to describe the cut-off, under-serviced and impoverished neighborhoods that have developed. Common knowledge being what it is, that isn't to say that anyone should believe that cities necessarily increase or decrease stratification without making measurements but stories of urban inequality seems to be so prevalent in popular culture that it seems strange that one would state that the opposite is a popular expectation but they have citations so I'm not questioning that the idea is out there, only that it is surprising that it is so prevalent that they need to open their article as though they are bucking a trend in the literature.
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hn_throwaway_99
1 year ago
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I think you are misunderstanding the argument. Yes, there have always been rich neighborhoods and poor neighborhoods in cities, but the idea was that with everyone "packed in" together and making use of shared resources like sidewalks, stores, and subways, that people would essentially be forced to come into contact with others from different socio-economic levels.

I agree with AnimalMuppet's comment - car-centric behavior kills this. For example, if you go to older cities that were developed "pre-car" in the US like NYC or Boston, I feel like you get more interaction just because you're likely to interact with more people on the sidewalks or subway/T. Living in a car-centric city like Austin is totally different. As much as Austin likes to promote its progressive ethos, this is definitely one of the most segregated cities I've ever experienced, even more so now that housing prices have gotten insane - poorer people live further out, and the public transportation system is pretty abysmal and there is much more of a socioeconomic divide in people who use it (primarily because, and I see this all over the US, but many people love to talk about the need and benefits of light rail, but buses are often seen as "for the poors").

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wongarsu
1 year ago
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But in cities that aren't car centric you commonly have stores embedded into the neighborhood at walkable distance. For everyday needs like groceries you just go to whatever shop is closest, which will be a posh Whole Foods in a rich neighborhood and a cheap discounter in a poor neighborhood.

You share sidewalks, public transportation, etc when going for work or shopping for something that isn't a daily necessity. But the same could be said about less urbanized places.

The counter argument are towns and villages that only really contain one socio-economic group. You can have small towns that are basically only rich people, or only poor people. Cities provide less segregation than that.

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mathgradthrow
1 year ago
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Nothing makes you hate people like interacting with them on public transit.
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tremon
1 year ago
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Try interacting with them via the button on your steering wheel.
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4848484
1 year ago
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I can't speak for the whole country but having lived most of my life around dense parts of California I'd choose dealing with fighting traffic over the dregs on public transit every single time. I still distinctly remember back when I'd take the the bus to the local community college for my pre-transfer credits where a few times I had to intervene to help women who were being harassed. And that's just one problem type! It's not counting all the other enjoyable public transit experiences like when I'd stand for the entirety of my bus ride because the only open seats were beside some junkie mumbling erratically or even sometimes inaccessible because a hobo had brought a literal sack of trash to fill the space beside them.
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vladvasiliu
1 year ago
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I’ve never been to Boston or Austin, but here in Paris many people take the public transit, be it metro or buses: rich, poor, and in-betweens.

Talking to random strangers when out and about is very much not the norm. Being forced to come into contact with the others is seen more as a negative than a positive.

The only places where I see some kind of mingling is where that’s the goal, such as bars, and possibly “hobbies”. Although, IME, even those tend to have people from similar “categories”.

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AnimalMuppet
1 year ago
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In the US, there used to be the idea of "sidewalk culture" - deliberately structuring cities so that different kinds and classes of people would meet, literally on the sidewalk, and from that would form, at least to some degree, a shared culture. There was the idea of deliberately breaking the silos that separate people. And maybe that even worked.

Worked. Past tense. In most of the US, it's now a car culture. And even in cities where people walk, it's now an earbud culture.

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yterdy
1 year ago
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I'm not sure GP is accurate, even without that. The privileged descending to the lower quarters to hobnob with the masses is as old as civilization, and of course the working lower class generally have to go where everyone else is to serve them. If segregation is increasing, there are plenty of mechanisms to point to, also: anti-poor urban design protocol (including law enforcement-related), low/no-contact resource delivery, WFH, the increased cost of transportation and housing, etc.

It's not actually a surprise that society is bifurcating, is it? Not after the anaphasing of school demographics, voter behavior, and so on.

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jjav
1 year ago
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> In the US, there used to be the idea of "sidewalk culture"

> In most of the US, it's now a car culture.

In my experience cars have nothing to do with this. I grew up outside the US in a very car-required area.

And yet what you call sidewalk culture was and is the norm of daily life. You go outside, meet the neighbors, play board games on the sidewalks, have beers with them deep into the evening, simply hang out outside a lot. I miss this a lot.

In the US they invented an actual fake crime for the idea of hanging out outside - loitering. You try your sidewalk culture in the US and the police will show up to break up your illicit activity (eyeroll).

In the US you must be at home or at work or commuting between them, or spending money shopping or in some corporate-sanctioned entertainment venue.

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kjkjadksj
1 year ago
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Even take out the cars sidewalk culture is dead when the rich people are buying coffee for $7 and the working class are getting it from the self serve pitcher in the gas station. A lot of places today are highly economically stratified thanks to the prices of goods and services offered. It also doesn’t help that when people close their eyes and imagine “third place” somewhere that obligates you to spend money to be there comes up.
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randomdata
1 year ago
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I was definitely taken back by that statement. Marginalized groups, for example, have always noted how cities offer increased isolation away from bigots as compared to smaller towns and rural areas. It may be a prevalent idea in academia, but I'm not sure anyone thinks that way on the streets.
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emanuele232
1 year ago
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Actually i do agree with the statement. I live near the biggest city in my state and my friends are different in ideas, political opinions and preferences (also kinda different in economic possibilities) due to the fact that we all went to the same highschool, and there are few places where the young can socialize. on the contrary my brother lives in that big city and its friends are ALL coming from the same cultural background, with the same ideas and the same political leaning (that he chooses during university)
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eitally
1 year ago
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A lot of that has to do with the fact that you chose your friend group during public high school and he chose his during university, which itself already selects for the upper socioeconomic statuses.
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feedforward
1 year ago
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> urbanization increased social stratification

Urbanization increases social stratification in that the upper class and the upper middle class tend to live in or near cities. As far as the poor and working class, the majority live outside cities in agricultural societies, and in or near cities in modern societies.

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fidotron
1 year ago
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It is worth saying what you describe is the classic European view of things. In English-speaking countries post industrialisation the reverse was the case, with inner cities being the regions of notorious poverty, with the upper classes engaged in rural pursuits as a pure leisure activity.
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eitally
1 year ago
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It's important here to differentiate between the big cities and the next tier. The big, dense cities (SF, NYC, Boston, London, Tokyo, etc) have accumulated wealth and privilege within the city and lower income folks are on the perimeter. In second tier cities, it's more common for suburban sprawl to have led to "white flight" and wealth accumulation outside city centers... but those cities frequently don't have near the economic draw in their downtowns anyway so it doesn't matter.
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marcosdumay
1 year ago
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IMO, the GP was perfectly clear, and there's no need to misunderstand it on purpose to insist on some unverified narrative.

You could just as easily disagree, with a valid point.

(And anyway, the phenomenon you are talking about stopped on most of the world at around the middle of the last century. The very few exceptions where it is still happening do not support you claiming it's a rule.)

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randomdata
1 year ago
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> the upper class and the upper middle class tend to live in or near cities. As far as the poor and working class, the majority live outside cities in agricultural societies

I'm not sure that tracks. Farmers are the epitome of the upper to upper-middle class, deriving their living wholly or mostly from land and capital ownership.

Perhaps you meant upper to upper-middle income rather than class?

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Swizec
1 year ago
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> Farmers are the epitome of the upper to upper-middle class

This must be why in the 1950’s large swathes of Europe saw so many farmers fleeing their land to go live in the city and take up those new fangled factory jobs. Same for Britain in the 1850’s. Or China in the 2000’s.

Usually when people talk about “farmers” in the context of social class migrations, they mean subsistence farmers eeking out a living from the land. Not the modern American or European industrial farmer who in effect owns and runs a multimillion dollar business. Although I hear margins are razor thin even for those.

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FirmwareBurner
1 year ago
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>This must be why in the 1950’s large swathes of Europe saw so many farmers fleeing their land to go live in the city and take up those new fangled factory jobs.

Did they though? Doesn't match my knowledge.

Most farmers at the time who owned plots of fertile land would rather break their backs working the land themselves (even if for thin margins of subsistence farming) rather than move to the cities to live in cramped conditions and break their backs working factory jobs for low pay.

The only country folk who migrated to cities to take factory jobs were mostly people who didn't own much land or any at all, making them relatively poor, so a factory job in the city was a better prospect than poverty in the country side working someone else's land. But land owning farmers would never downgrade by going to work factory jobs.

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randomdata
1 year ago
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> This must be why in the 1950’s large swathes of Europe saw so many farmers fleeing their land to go live in the city and take up those new fangled factory jobs.

Sure? There is nothing about upperclass-hood that implies that it is desirable or infinitely maintainable. In fact, beyond the romanticizing of the upper-class we see in popular culture, I suspect most actually prefer to be working class, especially when coupled with an upper income. There are way fewer nightmares when your only concern is showing up to work.

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giraffe_lady
1 year ago
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It depends on what you mean by "farmers." Even small individually- or family-owned farms are going to depend to a large extent on seasonal agricultural labor. It's worth being clear when you talk about this whether by "farmers" you mean those laborers, who are often poor, or the landowners, who usually aren't.
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randomdata
1 year ago
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I have never heard of a definition of farmer that refers to hired labourers. Perhaps you are thinking of farmhand?
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dragonwriter
1 year ago
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Farmers (farm owners) are middle (petit bourgeois) class for small fanily farms dependent largely on the labor of the owners, and upper class for large farms, but are a small share of the rural population and, in modern society, the latter are not necessarily rural at all, whereas the bulk of rural population are farm or farm-supporting laborers.

The bulk of the modern upper class are non-farm-specific capitalists, who tend to be urban-dwellers, and bulk of fhe petit bourgeoisie (middle class) are non-farm-specific small business owners and elite urban laborers whose wages have sufficed ti give them a capital nest egg sufficient to be a significant share of their economic support mechanism.

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randomdata
1 year ago
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> dependent largely on the labor of the owners

The modern farm, even small family farms, relies on capital to do the work. The farm owner's input is into the management of the operation. If management is considered labour then there is no such thing as upper-class. You can't own land and capital without some management.

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dragonwriter
1 year ago
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> The modern farm, even small family farms, relies on capital to do the work.

All businesses rely on the application of labor to capital; if that labor is largely that of the owners, the owners are petit bourgeois, if it is predominantly rented labor of the proletariat, the owners are haut bourgeois. (In the simple case where the owners derive their support exclusively from that property.)

> If management is considered labour then there is no such thing as upper-class.

Management is labor, but that fact does not mean that there aren't a distinct class of people who, while they may incidentally do some labor in the marketplace, relate to the economy and derive support within it primarily through the returns of capital whose value is realized primarily by renting labor from the proletariat.

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randomdata
1 year ago
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> that fact does not mean that there aren't a distinct class of people who, while they may incidentally do some labor in the marketplace, relate to the economy and derive support within it primarily through the returns of capital whose value is realized primarily by renting labor from the proletariat.

Yes, we call them retirees. Who, incidentally, as a group have a slight preference towards small town living.

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ExoticPearTree
1 year ago
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From the article: As plausible as the cosmopolitan mixing hypothesis might seem, big cities also provide new opportunities for self-segregation, because they are large enough to enable people to seek out and find others who are similar to themselves

It kind of makes sense that people that earn more or have a higher potential want to mingle with people that are the same. There's no upside for better off individuals to stay in low income neighborhoods.

No matter how much subsidized housing or whatever, low income individuals will be priced out of events or social gatherings.

And the bigger the city, the more opportunities there are, the more segregated economically they tend to be because just a small percentage will "make it". And the rest I think will follow a half Bell curve.

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kridsdale1
1 year ago
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They’re also priced out of basic food in gentrified areas.

I posit that rich people actually enjoy having groceries cost double what they do just a few miles away, because it means only the ‘right people’ mingle with them in public.

Personally I exemplify this. I make enough to go to the fancy Whole Foods and shop in peace, whereas the local Safeway in the same neighborhood has people screaming and throwing objects and items are locked behind bars. Simple price differentiation keeps those people from bothering to enter WF.

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rahulnair23
1 year ago
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Washington D.C. is a great example of this.

While looking at residential location choice, around 10 years ago, you could discern a boundary (Georgia Ave in those days).

Netflix used to show the most popular movies by zip code, and one side of the boundary it was "Mamma Mia" and the other "Tyler Perry".

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alistairSH
1 year ago
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Across the river in Alexandria and the surrounding suburbs, this was true as well (not sure about Netflix, but the housing boundaries)

The bureaucrats, lawyers, doctors, and career officers (Pentagon) were highly concentrated in a few neighborhoods that border the Potomac (Old Town through Fort Hunt). A few blocks away, the Rt 1 corridor was largely working class or lower class, with some young enlisted families from Ft Belvior.

This extended to my high school - there were 3 buildings - first was arts/music, second was STEM and honors, and the third was the gym, auto shop, wood shop, and cooking. It's not hard to imagine there were students who never entered building 1. And the only reason I was ever in building 3 was the weight room and the one semester of auto shop I took.

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savanx
1 year ago
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I also went to West Potomac and spent hardly any time in Gunston.
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lucasRW
1 year ago
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Is that really news, or "counter-intuitive" ?

I have lived in several countries and always observed that, irrespective of the political views, people try to flee poor areas when they can, and try to have their kids put in good schools when they can.

This is particularly funny in the case of left-wing politicians paying extras bucks to have their kids in elitists white schools with strong discipline, while advocating "diversity" for the other kids when they are interviewed on TV at night.

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gloryjulio
1 year ago
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I have never seen non competitive elite class parents regardless they are left or right or races. When it comes to children, all bets are off and the only action is to send the children to the best school that's available
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lotsofpulp
1 year ago
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> This is particularly funny in the case of left-wing politicians paying extras bucks to have their kids in elitists white schools with strong discipline, while advocating "diversity" for the other kids when they are interviewed on TV at night.

There is nothing wrong with advocating for a society wide rule change, but still playing the game according to the current rules.

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ljsprague
1 year ago
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We suspect they don't really want the society wide rule change though.
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kjkjadksj
1 year ago
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They aren't playing the game by the rules in this example, they entirely misunderstand the game which shows their biases. The kid with two wealthy parents in a functional household is going to do well in life wherever they get their k-12. Sending them to private school signals you bought into racial fears over actual logic of what factors actually contribute towards these differential outcomes we see among public and private schools.
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lotsofpulp
1 year ago
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Having the right parents is one factor. Having the right peers is another. You are the company you keep.

One of the big problems with public schools right now is disruptive/slow students not being kicked out/remediated, hampering good students’ learning.

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kjkjadksj
1 year ago
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I think people really overweigh k-12 on outcomes anyhow. Thats never the difference maker, what you specialize in college certainly can be though. And you can be sure that the child of a wealthy person will be going to college no matter where they go.
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