Showing posts with label cities. Show all posts
Showing posts with label cities. Show all posts

26 February 2025

What’s the single biggest growth opportunity that no-one really tried?

Paul Collier and Astrid Haas just wrote an IGC blogpost “Why Kampala holds the single biggest growth opportunity for Uganda.” Single biggest? Well indeed, the first rule of blogging is HYPERBOLE, but then the first rule of reading blogs should be a heavy dose of scepticism. Second, I’m reminded of Michael Clemens’ presentation on The Biggest Idea in Development That No One Really Tried. Might migration (the kind that Paul apparently thinks is harmful for poor countries) hold a bigger growth opportunity for Uganda than better urban planning in Kampala?

At present, around 1% of Ugandans live and work overseas (roughly 400,000 of a population of 37.6 million). This 1% of the population send home 4% of Uganda’s GDP in remittances. According to a Gallup poll, around 35% of Ugandans would permanently move to another country if they were allowed to. If they all could, and sent back as much as current Ugandans abroad do, that would be a one-off 140% increase in Uganda’s economy. Or if Uganda had the same level of emigration as the UK does (8%, 5.2 million of a population of 64.1 million Brits live and work overseas), that would be a 28% increase in Uganda’s economy. And that’s totally ignoring the increase in income for the actual migrants themselves. Median income in Uganda is $2.5 per day (in PPP), so even a job on UK (“relative-") poverty pay levels of around $23 per day would be a NINE-FOLD increase for them. Needless to say, the main reason that more Ugandans don’t work in high-wage economies, is that the governments of high-wage countries impose restrictions on the entry of people, particularly those from poorer countries.

Brain drain I hear you say? Michael Clemens killed that one too (ethically it is pretty unreasonable to restrict individual's freedom to such an extreme extent, even if there were any real evidence that emigration of highly-skilled people hurt an economy, which there isn't anyway).

So yes, clearly planning Kampala’s urban development is important for growth. But does it really have more “potential” than something that could double the country’s economy overnight?

25 June 2025

Celebrating more Brits

The population of the UK has increased by 500,000 in the last year.

Unlike what you may read elsewhere, this is great news.

- British people are great - having more of us is better
- London is the best part of Britain, and not coincidentally the most populous and densely populated part
- Population growth is concentrated in cities
- Larger cities support economies of scale, more specialisation and diversification, enabling the clusters of activity and agglomeration that drive innovation
- A larger population means a greater supply of innovators
- A larger population means a greater demand for innovators, and a bigger market for producers
- A larger population means more people to share the burden of fixed costs, including national debt

Of course there are costs to crowding, and we need to plan for more infrastructure provision (not least building more housing), but that’s just part of life and really shouldn’t be beyond our wit.

20 February 2025

More affordable housing for London?

"Affordable housing" is a phrase which needs to go on the banned list. What does it even mean? Something to do with affordability, and something to do with social (subsidised) housing. Mira Bar-Hillel of the Evening Standard notes the wikipedia definition - affordable for someone on median income - coming to a back-of-an-envelope value of around £100,000 (assuming a mortgage of 4 times a £25,000 salary).

She then seems to go off the rails a bit discussing the application of this concept to an actual development - the new central London Mt Pleasant development.
"of the 700-odd flats proposed, fewer than 50 may be for social renting. It also means that, based on current prices in the area, the private flats could easily fetch a total of over £4bn. And be mainly sold to foreign investors.
So based on those numbers (£4bn for 700 flats), each of these flats could sell for more than £5 million each. And the Evening Standard's Property and Planning correspondent thinks Britain should be selling off £5 million pieces of real estate for £100,000? Is it just me or does that sound totally insane to anyone else?

Meanwhile Labour councillors are angry about Royal Mail being "hell-bent on packing in as much private housing as possible" whilst there are "huge housing shortages in London." Does Labour want less homes in London or more homes?

Why does housing policy inspire such epic logic fails from otherwise seemingly intelligent people?

27 February 2025

The political economy of slums in Africa

This is a guest post by Sean Fox at the LSE

Popular accounts of life in African cities typically portray a Dickensian squalor in the tropics: unkempt masses struggling with poverty, disease and violence. While such accounts overlook the dynamic nature of African cities and the resilience of their residents, they do reflect an important truth. Sub-Saharan Africa has the highest rate of ‘slum incidence’ of any major world region, with over 60% of the region’s urban population—roughly 200 million people—living in settlements characterized by some combination of overcrowding, tenuous dwelling structures, and deficient access to adequate water and sanitation facilities. However, there is wide variation in slum incidence across countries within the region (see Table 1). Why do so many Africans live in slums, and what accounts for the wide variation in slum incidence across countries in the region? I address these questions in a recently published working paper.

Table 1 - Slum incidence by region and for selected African countries

Slum population as % of urban population

2000
2005
2010
Region



  Developing Regions
39.3
35.7
32.7
  Sub-Saharan Africa
65.0
63.0
61.7
  Southern Asia
45.8
40.0
35.0
  South-eastern Asia
39.6
34.2
31.0
  Eastern Asia
37.4
33.0
28.2
  Western Asia
20.6
25.8
24.6
  Latin America & the Caribbean
29.2
25.5
23.5
  Northern Africa
20.3
13.4
13.3
Selected African countries



  Ethiopia
88.6
81.8

  Tanzania
70.1
66.4

  Nigeria
69.6
65.8

  Ghana
52.1
45.4

  South Africa
33.2
28.7

  Zimbabwe
3.3
17.9

Source: UN-Habitat (2008)

Social scientists have traditionally portrayed slums as a natural and temporary by-product of economic modernization. But the scale and persistence of slum settlements in developing regions in recent decades presents a serious challenge to this notion. A variety of theories have been advanced to account for this apparent deviation from the assumed path of modernization. Put together they tell a fairly simple story: urban population growth in developing regions has outpaced economic and institutional modernization. I refer to this as the ‘disjointed modernization’ theory of slums and test it empirically using regression analysis. In support of this theory, I find that nearly 70% of cross-country variation in slum incidence can be accounted for by variation in urban population growth rates, measures of income and economic diversification and a measure of institutional quality.

However, identifying the contemporary correlates of slum incidence does not amount to a convincing causal explanation for the scale and diversity of the phenomenon. Why did the process of modernization become more disjointed in some countries than others? To answer this question I trace the origins of divergence in urban development trajectories back to the colonial era. Generally speaking, colonisers stimulated urban population growth but laid a poor foundation for urban economic development and effective urban governance. But colonial experiences varied widely across countries in Africa. Where economic and political interests were strong, towns and cities received significant investment and institutional development; where economic and political interests were relatively marginal, towns and cities received minimal investment and were left with ad-hoc governance structures. I demonstrate that this variation is correlated with contemporary slum incidence. For example, Figure 1 below plots slum incidence against a measure of ‘British indirect rule’—i.e. the number of court cases adjudicated by indigenous as opposed to colonial authorities. The figure shows that slum incidence in 2005 is closely correlated with the measure of British indirect rule (a proxy for institutional investment) in 1955, supporting the hypothesis that the colonial era represents a ‘critical juncture’ in the history of urban development in sub-Saharan Africa.

Figure 1. Colonial strategies of rule and slum incidence in 2005

Having identified the colonial origins of ‘disjointed’ modernization, I turn my attention to the mechanisms of path dependency that have served to perpetuate colonial patterns of urban investment and institutional development. Post-colonial African governments have had anywhere between 25 and 50 years to redress the failures of their colonial forebears. Why have they not done so? I offer two complementary explanations.

First, urban underdevelopment offers myriad opportunities for political and economic entrepreneurs. For example, politicians and bureaucrats often use the absence of formal property rights in urban areas to engage in ‘land racketeering’—i.e. offering squatters on ‘public’ land protection from eviction in return for political support or economic rents. Similarly, the absence of water infrastructure yields very lucrative opportunities for the private vendors who inevitably step in to fill the void. In other words, urban underdevelopment has proven very profitable for a range of actors in African cities, resulting in the emergence of a broad constellation of status quo interests opposed to investment and institutional reform.

Second, an anti-urbanization bias emerged in development discourse and practice in the late 1970s. Up to that point, towns and cities were seen as engines of prosperity and progressive social and political spaces. But a series of influential publications in the 1970s and 1980s portrayed urbanites as economic parasites feeding off the surplus produced by peasants in the countryside and exerting an undue influence in public affairs. Investing in urban development came to be seen as anti-developmental. As a result, governments across Africa implemented policies to restrict or discourage rural-urban migration and promote rural development. By 2007, 78% of African countries had policies in place to restrict migration; up from 49% in 1976. There was also a significant contraction in international development assistance for urban development projects. As Table 2 demonstrates, World Bank shelter lending in the region, which began in 1972, shrivelled to near insignificance by 2005.

Table 2. Trends in World Bank shelter lending in sub-Saharan Africa, 1971-2005

1972-1981
1982-1991
1992-2005
Total shelter lending
$498 million
$409 million
$81 million
Equivalent per capita
$5.20
$2.74
$0.32
Notes: Shelter lending data from Buckley and Kalarickal (2006); per capita estimates based on total urban population in sub-Saharan Africa at the end of each period (i.e. 1981, 1991 and 2005) drawn from World Bank, World Development Indicators online database, accessed September 2012.

The proliferation of slums in sub-Saharan Africa in recent decades is de facto evidence of government failure to invest in urban development. But history is not destiny. As Africa’s urban population continues to grow, politicians are increasingly likely to find it in their inteest to address the basic needs of urban residents. And if they are committed to stimulating economic growth and diversification they will need to do so. Cities can serve as engines of economic development, but only if they have adequate infrastructure and their residents have safe, healthy and secure places to live. The international community could help facilitate this transformation by recognizing the urban potential and supporting (as opposed to discouraging) efforts to invest in urban development in the region.

-----
Fox, S. (2013) ‘The political economy of slums: Theory and evidence from sub-Saharan Africa’, Working paper series 2013, No. 13-146, Department of International Development, London School of Economics and Political Science.

13 February 2025

Does slum upgrading work?

A new colleague at OPM Ruhi Saith is a co-author of a new Cochrane systematic review on the impact of slum upgrading programmes on health and wellbeing (full summary here).

They find only 5 studies which can demonstrate any causality, from which they find:
  • "Limited but consistent evidence to suggest that slum upgrading may reduce diarrhoea in slum dwellers and that slum dweller’s water related expenses may also be reduced
  • Mixed results for whether slum upgrading can reduce parasitic infections, educational outcomes, financial poverty and unemployment outcomes
  • Very little information on other health or social outcomes, or which types of interventions were most beneficial"
Which reminds me of two things,

first, John Snow and the 1854 Broad Street cholera epidemic, when John used a mixed methods approach based on KII*, and a pathbreaking geographic data visualization infographic** which founded the science of epidemiology using one of the first natural experiments.

second, that there is really weak evidence that area-based initiatives have any impact on employment and well-being in the UK, and so policy should target people not places

Which suggests that slum upgrading should focus on providing the public goods and infrastructure with clear evidence of impact and cost effectiveness - namely clean water and sanitation - and be more modest about expectations for impacts on other outcomes which are not primarily determined by the slum environment, such as poverty, unemployment, and low education.

*Key informant interviews. Or talking to people. Yes I am mocking your terminology, quals.
**A map. Yes you too, data monkeys.

26 June 2025

Guardian economics fail #636352747

If the Guardian's economics leader writer actually knew even the very first thing about economics, he might be able to recognise that an increase in supply normally leads to a decrease in prices. And so new tall buildings in London should generally be celebrated for being exactly what is needed to cut rents, and are basically a total economic free lunch for the city and the country. And if you don't believe me, try the leading urban economists at Harvard or the LSE.

19 June 2025

Sex, fame, and economic geography

"We seek cities because there are a greater range of girls at the bar, of reproductive choice. Number one. 
Number two is there are better outcomes for health and wealth. And now we care more about the environment, and cities are better for the environment. But above all, talented people seek cities for fame. They can't get famous in the fucking village."
Boris Johnson. I'm not a fan, but it's a great quote. 

13 February 2025

Urbanization in Africa

Sean Fox, a cities expert at the LSE has a great new post up at the Africa@LSE Blog discussing how incorrect analysis has been leading to poor policy for years.

The popular mental model is that there is massive rural-urban migration in search of jobs.
"Since the mid-1970s, African governments have increasingly adopted policies designed to inhibit or discourage people from moving into urban areas. Today, approximately 80% of African countries have policies in place to prevent rural-urban migration. At the same time, international development organisations increasingly withdrew support for urban development initiatives in favour of rural development projects, often justified by the argument (among others) that improving standards of living in rural areas will help to mitigate the growth of urban poverty."
The trouble is, most urban population growth is actually just natural growth. And the rural-urban migration that does exist is driven by a range of factors, not just jobs, such as a "desire to escape age or gender discrimination in their communities, to find a wife or husband, to seek adventure in the “bright lights” of the big city, or to escape rural serfdom."

Which is actually pretty clear when you just look at the data. This is rural and urban population growth in Africa since the 1960s, based on the World Development Indicators (chart stolen from Ian MacAuslan). Cities are growing fast, but so are rural populations. 


And the last word from Sean;
"Simply put, the rapid growth of Africa’s urban population is being driven primarily by rapid population growth in urban areas, not rural-urban migration ... For those interested in easing demographic pressure in urban areas, the only humane policy option is to try to reduce population growth by promoting fertility decline through voluntary family planning initiatives. And for those interested in promoting economic development in the region, investment in urban areas should be top of the policy agenda." 
Read the whole thing here

14 October 2024

Census love

"In the absence of actual data (such as an official census), NGO staff make a back-of-envelope estimate in order to plan their projects; a postgraduate visiting the NGO staff tweaks that estimate for his thesis research; a journalist interviews the researcher and includes the estimate in a newspaper article; a UN officer reads the article and copies the estimate into her report; a television station picks up the report and the estimate becomes the headline; NGO staff see the television report and update their original estimate accordingly." (source: www.humanitarian.info) (via Map Kibera Project)
I honestly had no idea that Kibera is less than 200,000 people, and not over a million, despite the Kenyan census establishing this fact taking place 2 years ago. Via the Africa Research Institute

18 July 2025

Can Chindian Urban Planning Save the World?

If per capita carbon emissions in both China and India rise to U.S. per capita levels, then global carbon emissions will increase by 139 percent. If their emissions stop at French levels, global emissions will rise by only 30 percent. Driving and urbanization patterns in these countries may well be the most important environmental issues of the twenty-first century. 
Glaeser, Edward (2011). Triumph of the City: How Our Greatest Invention Makes Us Richer, Smarter, Greener, Healthier, and Happier (Kindle Locations 298-301). The Penguin Press. Kindle Edition.

07 December 2024

7 reasons why urban growth is a natural and normal phenomenon

The town of Dubai first conducted a census in 1968 (with approximately 59,971 inhabitants then) ... According to the Statistics Centre of Dubai, the population of the emirate is estimated to be over 1,800,000 as of 2010 ... Do the math!  
(HT: Our Word is Our Weapon).
OK. I make that an annual growth rate of 8%, not to be sniffed at. 108%. Dubai has more than doubled in population every year for the past 42 years.(Hey - this is a blog - there is very little editing and short deadlines, so occasionally there will be very stupid mistakes).

Rapid urban growth is not an inherently evil thing. In fact it is probably quite a good thing. Professor Mario Polèse offers 7 reasons why:
Seven Pillars of Agglomeration:
1. Economies of scale in production: For many industries, the average cost of producing goods declines as the scale of production expands. This can make it very profitable to concentrate production in a few large facilities and to locate those facilities close to lots of workers, namely near cities.
2. Economies of scale in trade and transportation: Delivery costs are lower when the trucks, planes, and ships going to and from transit hubs are fully loaded with goods. Filling trucks, planes, and ships is easier when they’re moving between urban areas with large ports, airports, and distribution centers.
3. Falling transportation and communication costs: Falling transport costs allow firms to exploit economies of scale, producing in one place and distributing to a large and geographically diverse market by road, air, or sea. Similarly, declining communications costs allow firms to concentrate productive activity in one place and distribute services to a wider market via airwaves, radio frequencies, and fiber optic cables.
4. The need for proximity with other firms in the same industry: Face to face interaction is important in industries where creativity, inspiration, imagination, or the cultivation of trust are key inputs. Proximity with other firms also lowers recruitment and training costs since a firm will have ready access to workers with industry-relevant skills.
5. The advantage of diversity: For firms, such as ad agencies, that need a workforce with a diverse skill set, will be better able to find and recruit workers from many different speciallized backgrounds if they locate near large cities where many different industries cluster.
6. The quest for the center: Firms that need direct access to customers will naturally locate in the geographic center of their markets. In many cases, this will mean locating in or near big cities. Polèse points to the example of Broadway. The concentration of performing arts in New York reflects access to the large local population but also theatergoers from other metropolitan areas that are linked to New York by rail, air, and road.
7. Buzz and bright lights: Cities with amenities like food, nightlife, museums, recreation, culture, and shopping tend to attract more people. Economists Ed Glaeser, Jed Kolko, and Albert Saiz find that high amenity cities grow faster than low amenity cities. They also observe that urban rents rise faster than urban wages, suggesting that people want to live in cities for reasons beyond rising wages. Even as information technology makes it possible for an increasing number of people to work from nearly anywhere in the world, the amenities associated with city life continue to attract and retain urban residents.