The big, bad city: mega-city myth?

Area of Science:

• Urban economics
• Development studies
• Environmental policy

Background:

• The 1970s literature often highlighted the benefits of large city size for developing countries.
• Rapid urbanization in developing nations has led to the growth of megacities, presenting complex challenges.
• Existing research may have overestimated the advantages of megacity scale.

Purpose of the Study:

• To critically re-evaluate the purported virtues of megacity size in developing countries.
• To analyze the negative externalities, capital costs, and productivity dynamics of megacity growth.
• To explore solutions for metropolitan management and spatial restructuring.

Main Methods:

• Literature review of 1970s urban development theories.
• Analysis of negative externalities, particularly pollution.
• Examination of capital costs and productivity advantages associated with city size.
• Assessment of spatial restructuring towards polycentric patterns.
• Evaluation of metropolitan management challenges and institutional frameworks.

Main Results:

• Declining megacity growth rates may indicate diminishing productivity advantages.
• Capital costs of urbanization escalate significantly with increasing city size.
• Urban management exhibits diseconomies of scale.
• Negative externalities in developing country megacities are physically severe, though monetary valuation is complex.
• Inappropriate government intervention can impede polycentric urban evolution.

Conclusions:

• The benefits of megacity size in developing countries might be exaggerated.
• Addressing negative externalities, escalating costs, and management inefficiencies requires targeted policy actions.
• Promoting polycentric development and effective governance is key to mitigating megacity challenges.