🇮🇳 Case Study 1: Mumbai, India (NEE)
Mumbai is India's financial capital and its most economically productive city. With a metropolitan population of approximately 21.4 million people in 2024, it contributes around 6.6% of India's entire GDP — more than the whole of many Indian states. It is home to the Bombay Stock Exchange, the headquarters of most of India's major banks and corporations, and Bollywood, the world's most prolific film industry by output, producing over 1,000 films per year.
Understanding Mumbai requires holding two realities simultaneously. Mumbai is a place of extraordinary wealth, ambition, and cultural vitality. It is also a place where one of the densest human settlements on Earth has grown in conditions of severe poverty, inadequate sanitation, and chronic flood risk — and where those two realities coexist within a few hundred metres of each other.
Dharavi: The Slum That Has a £1 Billion Economy
The name most associated with Mumbai's inequality is Dharavi. Covering approximately 2.4 km² — roughly the size of 340 football pitches — Dharavi houses an estimated one million people. By population density, it is one of the most crowded places on the planet. Western media has frequently portrayed it simply as a place of suffering, made famous internationally by the 2008 film Slumdog Millionaire. The reality is considerably more complex.
Dharavi has an estimated annual economy worth over £1 billion, generated by approximately 15,000 single-room factories producing leather goods, pottery, textiles, and recycled plastic
The recycling industry alone processes 80% of Mumbai's plastic waste, running an operation that formal businesses cannot match for efficiency or cost
Approximately 85% of Dharavi's residents have lived there for more than 10 years — Dharavi is not a transit camp for recent migrants but an established community with deep social roots, schools, temples, mosques, and local governance structures
Average household income in Dharavi is significantly higher than the Indian rural average — residents have chosen the city because it offers more, not because they had no alternative
However: housing typically consists of single rooms of 10–15 m² shared by entire families; access to clean water is limited to a few hours per day; toilet facilities are shared between many households; alleyways between structures are too narrow for emergency vehicles
Dharavi demonstrates a central tension in development geography: informal settlements are not simply problems to be solved. They are communities with economies, social networks, and cultural identities. Approaches that simply demolish them to build formal housing often destroy the social capital that made those communities function — and frequently price out the very residents they were meant to help.
Mumbai's Urban Challenges
Traffic congestion: Mumbai's average vehicle speed is approximately 10 km/h — slower than a brisk walking pace. The city has approximately 3 million registered vehicles on a road network designed for a fraction of that number. Annual productivity loss from congestion is estimated at $1 billion.
Solid waste: Mumbai generates approximately 5,000 tonnes of solid waste per day. The Deonar landfill, one of Asia's largest, regularly catches fire, generating toxic smoke that blankets nearby communities. Only a fraction of waste is formally recycled — the rest goes to landfill or is burned informally.
Air pollution: PM2.5 particulate levels in Mumbai regularly exceed 5× the WHO safe limit. Air pollution causes an estimated 16,000 premature deaths in Mumbai each year.
Flooding: Mumbai's location on a narrow peninsula, combined with inadequate drainage infrastructure and annual monsoon rains, makes flooding a perennial crisis. In July 2005, 944 mm of rain fell in 24 hours — the highest single-day rainfall ever recorded in India. Over 1,000 people were killed, hundreds of thousands of homes were flooded, and the city was paralysed for days. Dharavi's ground-floor homes were among the worst affected.
Housing shortage: Approximately 55% of Mumbai's population lives in informal settlements, despite the city's economic importance. The gap between Mumbai's GDP contribution and its ability to house its own workforce is one of the starkest expressions of urban inequality in the world.
Mumbai's Responses
Mumbai Metro: Metro Line 3 — a fully underground, air-conditioned rapid transit line running 33.5 km through the densest parts of the city — opened in stages from 2023 to 2024. The project cost approximately ₹33,000 crore (around £3 billion). It is projected to carry 1.7 million passengers per day, removing hundreds of thousands of car and bus journeys from the city's surface roads.
Slum Rehabilitation Authority (SRA): A government body that negotiates with developers to redevelop slum land. Developers receive permission to build commercial towers; in exchange, they must provide free replacement housing for slum residents on the same site. The scheme has rehoused tens of thousands of families, but has also been criticised for demolishing communities before replacement housing is complete, and for building tower blocks that replicate the social isolation of formal housing without the community networks of informal settlements.
Storm drainage investment: Following the 2005 flood disaster, Mumbai invested heavily in upgrading the Mithi river channel and constructing new storm water drains capable of handling 50mm of rain per hour (previously only 25mm per hour). However, climate change means extreme rainfall events are becoming more frequent, and the upgraded infrastructure may already be insufficient for the storms of the 2030s and 2040s.
