Idea in Brief

The Problem

Over the next 40 years the number of people living in cities will nearly double, to 6 billion. Yet even today many cities lack sufficient clean water, electricity, reliable public transit, and other basic resources needed to support their exploding populations and strengthen their economies.

The Argument

Governments don’t have the political will, money, or managerial skill to solve this problem on their own. A vast opportunity exists for the private sector to provide products and services that make the most efficient use of resources.

The Solution

These products and services—such as water desalination and incentive programs to smooth spikes in electricity demand—combine sophisticated technology with financial engineering that attracts capital by aligning the interests of many parties and offering investors a spectrum of risk and reward.

By 2050 the number of people living in cities will have nearly doubled, from 3.6 billion in 2011 to more than 6 billion. Yet the world’s urban areas are already overcrowded and, particularly in developing countries, suffer from shortages of clean water, electricity, and other resources essential to the support of their exploding populations and fragile economies.

A version of this article appeared in the July–August 2013 issue of Harvard Business Review.