IEEE's* Spectrum Online's June 2007 edition is a special report on megacities, including an article on Megacities by the Numbers from which the above graph is culled.
The graph shows the GDP (PPP) of the 20 largest megacities in 2005 and their projected GDP in 2030.
Going by the graph, our megacity's economy currently rides the same pack as Rio de Janeiro, Shanghai, Istanbul and Mumbai (at about $100 billion); and is ahead of Beijing, Cairo, Jakarta, Kolkata (Calcutta) and Delhi.
Metro Manila alone accounts for more than a fifth of the national income -and taken by itself, our megacity's economy would rank 60th among the world economies -just behind New Zealand and ahead of Sri Lanka. (The country currently ranks 24th or 25th.)
By 2030, with the exception of Shanghai which will race ahead, our economy will keep company with the same pack of cities (at about $250 billion).
The special report ("A How-To Manual for Megacities") is a must read for students of urban development, and includes:
- Megacities by the Numbers
The biggest, smallest, richest, poorest, most polluted, and best connected in the world.
- How to Measure a City's Metabolism
Like most cities, London consumes more than its fair share.
- How to See the Unseen City
A veritable museum of forgotten infrastructure lies buried beneath a city's streets.
- How to Build a Mile High Skyscraper
Behemoth buildings are becoming practical, thanks to new technologies and innovations in construction materials.
- How Not to Make a Megacity
On a good day, Lagos is exasperatingly corrupt, poverty-ridden, and dangerous.
- Life in the Megacity: A Photo Essay
And for simcity fans, a feature on the man who came up with Arcologies.
And, since the Spectrum is an engineering journal, the special report also highlights Shanghai's plans for a new green city (Dongtan); Sao Paolo's complex transportation system; Mumbai's power generation and distribution system; Tokyo's earthquake management system; and, New York City's hi-tech crime monitoring center.
- How to Design a Perfect City
Paolo Soleri imagines systems as intricate and insular as ocean liners
*Institute of Electrical and Electronics Engineers
All GDP figures in PPP