Why Dhaka Is One of the World's Fastest-Growing Megacities

Dhaka's explosive growth—from 3 million (1980) to ~22 million (metro, 2023)—exemplifies unplanned urbanization in the Global South. Six interconnected drivers:

1. Rural-Urban Migration at Scale

Push: river erosion (1M+ displaced/yr), agricultural underemployment, climate vulnerability. Pull: garment factories (4M workers, 80% female), construction, services. Daily in-migration: ~2,000 people.

2. Economic Primacy

Dhaka generates 35% of Bangladesh's GDP, handles 90% of formal trade, hosts central bank, stock exchange, and nearly all corporate HQs. No viable secondary city exists—Chittagong (port) and Sylhet (remittances) are specialized, not diversified.

3. Demographic Momentum

National TFR ~2.0 but urban TFR higher due to migrant age structure. Natural increase + migration = 3–4% annual urban growth. Median age: 24. Youth bulge fuels both labor supply and service demand.

4. State-Led Spatial Policy

Successive governments concentrated infrastructure (metro rail, elevated expressway, Padma Bridge, EPZs) in Greater Dhaka. Special Economic Zones (100+ nationwide) cluster near capital. Decentralization rhetoric lacks fiscal follow-through.

5. Real Estate Speculation

Land prices up 500%+ (2000–2020). Developers build high-rises on floodplains, wetlands, agricultural land. Formal planning (RAJUK) bypassed via political connections. 40%+ structures lack permits.

6. Governance Vacuum

Two city corporations (DNCC, DSCC) + 3 municipalities + 4 cantonments = fragmented authority. No metropolitan governance. RAJUK (planning) lacks enforcement. Result: traffic paralysis (avg speed 7 km/h), waterlogging, aquifer depletion, air pollution (PM2.5 5–10× WHO).

The Sustainability Question

Dhaka's growth is "fast" but not "smart." Without metropolitan governance, climate adaptation (flood/heat), transit-oriented density, and secondary city investment, the city risks becoming a dysfunctional megacity—productive but unlivable.