There's a credible argument that the 21st-century will be shaped more by cities 
than by nation-states. Here is a thoughtful framework for what would be 
required for that to happen. 

E

https://medium.com/sidewalk-talk/the-first-principles-of-urbanism-part-ii-53aec76799ff#.t8jhlqexu

The First Principles of Urbanism: Part II
Digital technology can be good or bad for cities. Which way it goes depends on 
how well technologists and urbanists work together.

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Last week, I shared the results of an effort we undertook at Sidewalk Labs to 
think through the first principles of urbanism. To recap, we concluded that 
urbanism is basically density. Yes, yes — big shocker. But the more significant 
takeaway is that what makes cities more or less attractive over time is how the 
efficiencies of density balance against the costs of density. Call it, if you 
will, the trade-off between good friction and bad friction.

The efficiencies were these:

Density enables much lower consumption of resources and time.
Density enables higher asset utilization.
Density entails frequent physical interactions.
And the costs were these:

Density leads to a reliance on central systems.
Density increases the need for courtesy and trust.
Density requires coordination and negotiation.
This exercise isn’t just a parlor game. What’s useful about these good and bad 
frictions is that they represent a framework to explore how technologies might 
impact urban environments. This type of tool can guide technology firms hoping 
to responsibly deploy new innovations in cities; otherwise, companies like 
Sidewalk can find ourselves developing technology that is urban in application 
but doesn’t actually make cities better. It’s also helpful to policymakers 
working to protect the public interest, because it can highlight what the 
long-term impacts of a given technology might be.

Before we tried to think about the future, we tested this framework against the 
past. Can it help us understand, for example, the last century and a half of 
American urban history?

Turns out it can.

The principles of density past

The greatest era of urbanization in America was between the 1880s and the 
1920s, what historians label the Progressive Era. Using our first principles of 
density, we find that during this time the efficiencies of density became far 
more valuable than they had been previously. New forms of infrastructure — 
sewer systems, electric lines, streetcars, and the like — were expensive, so 
they could only be built where asset utilization was high. Compared to the 
overall cost of living, energy and water were much larger expenses than they 
are today, so lower resource consumption was valuable. And for the most part, 
physical interactions were still required to share information.

At the same time, the costs of density declined dramatically. Managerial and 
technological advances made central systems much more efficient, in everything 
from supplying food to running transit systems. The biggest challenge around 
courtesy and trust at the time — namely, the spread of contagious disease — 
benefited from sewer systems, public health standards, and other improvements. 
And coordination costs in cities remained relatively low (for reasons that 
aren’t worth celebrating): labor costs were low and public input was minimal, 
so infrastructure could be built fairly quickly.

All in all, technology made the efficiencies of density hugely more powerful — 
and the costs way less so — than they had been before. As a result, cities grew 
dramatically.

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(Source: U.S. Census Bureau)
The middle of the 20th century saw the opposite trend. As overall standards of 
living increased, resource efficiency became less valuable; this was the era 
when people talked about having electricity “too cheap to meter.” As the 
federal government funded massive infrastructure investments, such as rural 
electrification and interstate highways, asset utilization declined in value. 
The proliferation of telephone, radio, and television reduced the need for 
in-person interactions to share news and do business, while cars made physical 
interaction on city streets far less desirable than during the 
pedestrian-streetcar-horse carriage days.

At the same time, the costs of density actually increased — though in many 
cases for good reasons. The unionization of public sector workers raised the 
costs of central systems even as it provided a middle-class living to bus 
drivers and sanitation workers. The civil rights movement and the increase in 
non-European immigration made courtesy and trust something that had to be built 
rather than enforced through homogeneity and exclusion. And more effective 
local democracy, developed partly in reaction to the excesses of city-builders 
like Robert Moses, increased the consideration given to neighborhoods and the 
environment, though in doing so it raised the coordination costs of getting 
things done in a dense setting.

As a result, the frictions of density became more intense, and the efficiencies 
of density became less valuable. And suburbs became the answer for millions of 
American families and companies.

I’d argue that the American urban renaissance of the last 20 years has seen a 
similar set of changes, often more economic than technological. As 
infrastructure investments have declined, traffic congestion has extended far 
into the suburbs, making walkability, bikeability, and transit more attractive. 
Water shortages and climate change have made resource efficiency important 
again. The internet has reduced what I’d call “utility shopping,” turning 
retail into a leisure activity in which a walkable environment is more 
attractive than a shopping center anchored around a parking lot. This shift, in 
turn, has increased the value of physical interactions, especially the 
unplanned interactions that drive creativity.

Concerns about trust — another word for safety — have declined as inner cities 
have gotten safer over the last generation. And, like traffic congestion, the 
costs of coordination have extended into the suburbs, as NIMBYism has become as 
much a suburban as an urban phenomenon.

All of these trends, I would argue, have made density relatively more 
attractive, and encouraged Americans to return to the city.

The principles of density future

So, what does the future hold? Of course we can’t know for sure. But our 
guesses right now go like this:

Overall, technology promises to make many of the efficiencies of density less 
valuable. Vehicle autonomy will reduce travel times and congestion, making the 
shorter distances of urban areas less valuable outside of the immediate, 
walkable neighborhood. And even though I’ve worked on urban climate change 
policy for more than a decade, I’ve become convinced that solar roofs, 
small-scale battery storage, and electric vehicles will soon make it more 
possible for suburbs to become more carbon-neutral than big cities, which can’t 
generate as much clean energy onsite. (A smaller roof space-to-population ratio 
is yet another implication of density.)

Assets — from household appliances to utility networks — are likely to 
incorporate more and more technology, which will increase their costs. But at 
the same time, smarter construction techniques, including robotic construction, 
should be able to make construction cheaper, cleaner, and less disruptive. 
Further, technology will make it easier to utilize assets well even in 
lower-density areas: not long ago, the only place in America that had truly 
plentiful, on-demand taxi service was Manhattan; today, TNCs have brought that 
kind of asset utilization to medium-density areas across the country.

Finally, we can assume that virtual reality and related technologies will 
reduce — although never eliminate — the need for physical interactions among 
people. Just as recorded music changed the nature of live performances, and 
Amazon changed the nature of shopping, I think we’ll see the same phenomenon 
with working together and dining out: they will become more valuable but less 
frequent.

But technology also holds the promise of dramatically reducing the bad 
frictions of urban life. With big data, computer intelligence, and location 
tracking, we can imagine central systems that are far more efficient and offer 
far greater performance than they do today. It should be the case that transit 
becomes better and cheaper, that central utilities decline in cost, and that we 
can find ways to share or centralize new things ranging from power tools to 
dining rooms.

We also expect that technology can help increase trust and courtesy. We know 
the power of online reputation as a way to ensure good behavior among people 
who don’t know each other. We know that data and computer vision enable huge 
leaps in security. But we can imagine things like using noise monitors to 
enforce nuisance ordinances, and even perhaps to cancel out noise, thereby 
reducing the number of complaints people have about their neighbors.

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An Uber self-driving car cruises the streets of Pittsburgh in May 2016. (Foo 
Conner / Flickr)
And we know that technology can help reduce coordination costs. Online voting 
should enable more frequent consultations that reach a broader constituency 
than people who attend public hearings. And technology should enable us to 
negotiate space much more effectively: if we can move to a world of shared 
autonomous vehicles, we can virtually eliminate parking problems — a primary 
stated reason that many neighborhoods across the country oppose greater housing 
density.

So we’ve concluded that technology will make everything better. (Maybe I am 
learning to speak technology!) What it really means is this: the key question 
is not whether it will change the efficiencies and costs of density, but which 
will change faster. Because what our framework tells us is that we are in a 
race. If the advantages of density decline faster than the costs of density 
decline, people will increasingly seek less dense neighborhoods. And if the 
reverse happens, we’ll continue to see an urban renaissance.

A call to action for urbanists and technologists

So I’m left with two big implications.

The first is that technology will help make mid-density communities work 
better. As much as I am a loyal New Yorker, we don’t need Manhattan levels of 
density to make great urbanism. It’s actually at the lower levels of density 
where growth leads to the strongest pushback against further density. Traffic 
congestion, parking, fear of new neighbors, and other issues often conspire to 
turn otherwise thoughtful citizens into knee-jerk NIMBYs. So technology — 
especially the shared, autonomous vehicle — should make it easier to create 
mid-density, mixed-use developments, and to add moderate amounts of density to 
suburban areas.

That’s a good implication, because a lot more Americans will be interested in 
living in a medium-density neighborhood than a high-density one. The other 
implication, however, is more sobering.

As I look at the various things that technology can do to neutralize the 
benefits of density, I see a range of things that consumers will likely choose 
to adopt on their own: virtual reality, autonomous vehicles, household solar 
power. Even when they take place in broader social or policy contexts, these 
are still individual decisions. That means the efficiencies of density will 
decline at the rate of consumer adoption and private-sector innovation. And 
that rate is typically very fast.

But the things that will make urban life easier are things that consumers 
cannot do on their own: incorporating technology into central systems like 
transit agencies, or tackling the very real challenges of balancing privacy and 
security in public spaces, or developing tech-enabled approaches to public 
consultation. This means that the costs of density will decline at a rate that 
depends on the public sector. And that rate, often, is very slow.

That’s the risk to cities from technology. It’s not that AVs will lead to 
sprawl, or that virtual reality will keep people in their homes. The main risk 
is that urbanites will not move quickly enough to use technology to make it 
easier to live in cities. And that is what I have most clearly taken away from 
this thought experiment.

For a firm like Sidewalk Labs, and others working in urban tech, it should lead 
us to spend a little extra time on thinking about products and applications 
that can reduce the frictions of urban life.

But for urban policymakers, it should be a call to action. Because it means 
that the future of cities depends on how quickly the public sector can 
integrate technology, not on how quickly entrepreneurs and firms can innovate. 
Between 1880 and 1920 — that golden age of the American city — city officials 
were among the most aggressive, energetic, and tech-savvy members of society. 
They built water systems, sewer systems, streetcar networks, and electricity 
systems. They used public-private partnerships to build subways. They invented 
the public authority to build bridges. And they developed new forms of 
governance to manage it all, such as the council-manager system.

So it’s not the case that government is always slow, or wrong. Just like it’s 
not always the case that the private sector is always fast, or right. But it is 
the case that digital technology can be good or bad for cities; which way it 
goes will depend not only how quickly entrepreneurs innovate, or how quickly 
cities adopt technology, but on how well technologists and urbanists work 
together.

If we want cities to win the 21st century, it turns out we urbanists had all 
better learn to speak technology — soon. But it also turns out that if 
technologists want to make cities better, rather than just different, they need 
to learn to speak urbanism as well.

A version of this post was delivered at the American Planning Association’s 
2016 Policy and Advocacy Conference in Washington, D.C.

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