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Most true suburbs aren't within the big city limits, so I'm not sure your point is well-founded. For example, in the DC area, the suburbs aren't even in the same state as the city and yet the suburbs seem to be thriving.
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The road network expansions and maintenance required to support the suburbs does. Ottawa has this exact problem. They are widening inner-suburb roads to satisfy demand created by outer-suburb development. A double-whammy.
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Those suburbs outside the city limits still need money. They get it from state and federal funds which were mostly collected from people in the city limits. For example the Highway Trust Fund as one of many examples. If you check the per capita spending, it's higher for suburbanites than urbanites but the urbanites are putting in more money.
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Absolutely not in the case of the DC metro area, on both the MD and VA sides. Those counties subsidize DC proper in various ways, along with the less populated portions of their own states, and because the median household income is so high, they also pay a disproportionate amount of federal income taxes when compared to DC residents.

I also have no idea why you think city dwellers are the primary contributors per capita to the Highway Trust Fund which is funded via a tax on fuel (i.e. miles driven).

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DC is an exception, most American cities have large swaths of suburbia within the city limits and even larger ones within the same state.
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“Seem to be” being the key words.

There’s been somewhat of a continuous cycle of movement with the upper class of America that goes something like this:

1. Move in to the latest newly constructed suburb with low taxes and fresh housing stock

2. Infrastructure ages, tax rates increase, housing standards evolve, the upper class moves to the next new suburb built on former farm land

3. The inner suburb declines, becomes low-income, companies leave, and infrastructure crumbles. Municipal debt piles up, sometimes the city goes bankrupt.

This is especially obvious in cities where regional growth didn’t continue upward forever.

I recommend reading up on Strong Towns’ growth ponzi scheme content.

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The Bronx is sub-urban? As someone else noted, Manhattan and The Bronx are totally different in ways that probably has little to do with population differently.
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So, what policy do you change after you learn that economic activity always concentrate on a small part of the city? You go and outlaw a natural law?
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1. Stop restricting what can be built, especially in the super valuable city centers

2. Shift taxes off of building (which punishes development) and onto the passive holding of land (which discourages idle land speculation)

In other words, change man's laws, not nature's.

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You know that both of those will make the disparity larger, right?
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You aim to build more centers and less outlying regions.
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Utilities and roads out into the suburban may be underpriced, but there’s a dark side to cities too. The suburbs and rural areas are often where people can afford homes.

I’ve had this hypotheses for a long time that the car is, at least economically, only incidentally about mobility. In reality it’s a tool for obtaining leverage in the real estate market.

Without sprawl urban landlords would have a captive audience and would extract all surplus. See: the law of rent.

I have a related hypothesis that the car drove the mid century middle class explosion in the US and some other countries, not by providing car jobs or any of the other conventional mechanisms but by allowing people to escape the law of rent.

Telework does this today for those who can use it, allowing people to leave high cost cities where good jobs are concentrated. The car did that until we reached the scaling limits of sprawl.

Also why I am a huge fan of Georgist taxation. Unfortunately we are moving in the opposite direction, taxing productivity and investment and wealth instead of taxing land and rent.

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Yeah well the problem is that after a moderately prosperous person buys a car and a house out in the suburb, the act of having spent half a million dollars makes them believe that they are entitled to drive their car into the city and enjoy the commerce and culture that the city fosters, plus free parking and toll-free roads and subsidized gas. None of those are great! In my town this manifests as people who live just over the county line in unincorporated places who nevertheless feel entitled to participate in city deliberations over road design and parking policies.
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"Those big spikes you see in the center? They cost very little for the city to maintain, and generate oodles of tax money."

This is just false. The biggest cost in the suburbs is education. In the city cores, education costs exactly the same or more (per capita) but police services are the biggest expense. You are confusing the expenses of commercial property (where nobody lives) with residential property. But people still live in those urban cores and the expenses they generate are substantial.

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> Those big spikes you see in the center? They cost very little for the city to maintain, and generate oodles of tax money.

May I introduce you to the budget for the MTA that is larger than the GDP of several countries?

Cities are _expensive_. Especially dense cities like NYC.

> Those big, wide areas out towards the fringes? They generate next to no tax income and cost a lot to maintain.

And this is the biggest lie.

These suburbs? They generate most of the wealth in the US because the most affluent people live there. Buildings don't produce value, _people_ do.

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> Cities are _expensive_. Especially dense cities like NYC.

But much cheaper per capita than everyone owning a car, an acre, traveling long distances for everything, and providing infrastructure etc. for all those people. MTA provides 6.5 million rides per day (!). Imagine that in daily car trips.

https://www.mta.info/document/194491

The difference is that people need to put their money together and build shared resources like the subway, and then then some think it's more expensive because taxes and expenditures are higher. But you don't need a car, gas, insurance, etc.; the store is two blocks away; there is much more of everything. It works really well and people pay lots of extra money to live in much smaller spaces in cities.

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> But much cheaper per capita than everyone owning a car

No, it's not. One ride on MTA costs around $20. The average US commute is 40 miles (both ways), so that $20 is actually more expensive than the IRS value for car depreciation.

> MTA provides 6.5 million rides per day (!).

Easily. Look at Houston, TX. Then compare the cost of real estate between Houston and NYC. I suggest to look at the average square footage of residences.

Make sure you don't cry when you realize how much NYC is screwing with your perception.

> But you don't need a car, gas, insurance, etc.

Why are you assuming that subway is cheaper than a car?

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> One ride on MTA costs around $20.

? The subway is $3 and the most expensive bus is I think $7.xx [0], and those are without bulk purchase (e.g., monthly passes) or discounts (seniors, etc.). Do you mean something like the Long Island Railroad? That goes out to the suburbs; it's not much part of NYC density.

> The average US commute is 40 miles (both ways)

Do you mean 80 mi total?

The IRS milage depreciation number and is now 70 cents/mile [1] and doesn't include insurance. I'm not sure it includes overall depreciation of the car's value due to age (i.e., excluding milage?).

40 mi daily would be $28/day, 80 mi $56/day.

> Easily. Look at Houston, TX. Then compare the cost of real estate between Houston and NYC. I suggest to look at the average square footage of residences.

Square footage in NYC is smaller, of course, which has the side effect of density. Overall people far prefer NYC to Houston (based on supply and demand and prices). I'm not sure what your point is beyond that? Do you mean Houston has as many commuters as NYC? Obviously that's not true.

LA might be an example of something approaching NYC scale without much public transit.

[0] https://www.mta.info/fares-tolls

[1] https://tax.thomsonreuters.com/blog/calculating-vehicle-depr...

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> The subway is $3

It's a lie. The true cost is around $20, and with capital expenses of new construction, it's closer to $30. Although pricing the capital construction cost is always tricky.

You just don't see the true cost in the _ticket_ price, because productive citizens in suburbs are forced to subsidize inner-city transit through taxes.

You can compute the true cost of a ride by trivially dividing the total yearly budget by the total number of trips.

> Do you mean 80 mi total?

No, 40 miles of total driving within a day.

> Square footage in NYC is smaller, of course, which has the side effect of density. Overall people far prefer NYC to Houston

No. People don't so much _choose_ as are forced to stay in NYC by economics mercilessly crushing them into dense shoebox-sized apartments.

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