Inequality and Quality of Life in Megacities

Explaining the Quality of Life Divide

The divide in megacities is driven by social inequality, where different groups have vastly different access to opportunities. This is most visible in the informal economy, which consists of untaxed, unregulated cash-in-hand jobs. In megacities like Dhaka, Lagos, and Mumbai, between 60% and 75% of the workforce rely on informal labour.

The Cycle of Underinvestment

A critical reason for variations in quality of life is the vicious cycle of taxation and investment. Because the informal economy is untaxed, megacity governments struggle to generate enough revenue to improve poor areas.

• Lack of Tax Revenue: In Mumbai, 60% of the population works in the informal sector and remains "outside the tax net," meaning they do not pay income tax.
• Infrastructure Gap: Even though Mumbai generates 33% of India’s total tax revenue, the government lacks the specific local funds needed to provide piped water or sewerage to slums.
• Prioritising the Formal Sector: Often, limited government investment is directed toward Special Economic Zones (SEZs) or high-tech hubs to attract Foreign Direct Investment (FDI), leaving informal settlements neglected and widening the gap in services.

While the informal sector provides vital opportunities, such as Dharavi's recycling industry with a turnover of £350 million to £600 million, the work is hazardous. Because wages are so low ($1.25 to$1.50 per day in some areas), residents have almost no disposable income after paying for basic necessities.

Access to Services and Infrastructure

Quality of Life (QoL) encompasses overall well-being, while Standard of Living (SoL) is a quantitative measure of wealth. Both are impacted by unequal access to services, measured using social indices like literacy rates.

Sanitation and water access show extreme variations. In Mumbai's slums, an average of 81 people share a single toilet seat. Infrastructure stress is severe in Mexico City, where over-extracting aquifers causes the city to sink by $15\text{cm}$ to $40\text{cm}$ a year, snapping pipes.

Worked Example: Infrastructure Gap

Calculate the percentage point difference in piped water access between Mumbai's slum households (16.7%) and the city average (50.7%).

Step 1: Identify the values to compare.

• City Average = $50.7\%$
• Slum Access = $16.7\%$

Step 2: Subtract the slum access percentage from the city average. $\text{Difference} = 50.7 - 16.7$

Step 3: Calculate the final value.

• $\text{Difference} = 34.0$
• There is a 34.0 percentage point gap in infrastructure access between slum dwellers and the wider city.

Judging the Scale of Variations

To evaluate the scale of inequality, geographers weigh numerical facts against subjective human experiences.

Quantitative data includes the Gini coefficient, which measures inequality from 0 (equality) to 1 (inequality). Mexico City has a high Gini of approximately $0.48$. Other social indices like Mumbai's 96% literacy rate can be misleading, as child labour often disrupts actual schooling.

Qualitative data provides a different perspective. Visual evidence, such as the $2 billion private home 'Antilia' towering over Dharavi's shacks, highlights the physical proximity of wealth and poverty. Lived experiences reveal hardships, like residents waking at 5:30 AM to queue for standpipes. Yet, qualitative interviews also show that slums often possess high community spirit, whereas wealthy gated communities can feel sterile.

Concluding Judgment on the Severity of the Divide

Ultimately, the scale of variation in megacities is extreme and systemic. While qualitative data reveals community resilience, the quantitative evidence of the "infrastructure gap" and the lack of legal housing tenure suggests a divide that is hazardous to life. The cycle of low tax revenue from the informal sector prevents the government from closing this gap, ensuring that economic growth does not "trickle down" to the majority.