Created for PwC's magazine Cities of Opportunity, this chart tracks a number of variables for the 30 cities included in the study. Population by segment, density, dependency rate, etc. 

Charts of such information density are very interesting to create. Each variable has its own fabric, a pattern. For example, you can scan the population density across all 30 cities, and easily see that Sydney has a lot of space for its inhabitants, while Mumbai is very crowded. Then you can compare land area, and arrive to more conclusions.