How Cell-Phone Minutes Can Help Map the Distribution of Wealth in Africa

Without reliable government data, a group of researchers theorizes that the size of airtime purchases in Côte d’Ivoire roughly approximates wealth.
More
A man dressed in traditional attire speaks on a cell phone during the annual Reed Dance at Ludzidzini in Swaziland. (Siphiwe Sibeko)
 
A group of Belgian researchers has come up with a novel way of mapping the distribution of wealth in Côte d'Ivoire--by looking at purchases of mobile airtime minutes. After combing reams of data on individual purchases from a national mobile operator (unnamed in their report), they discovered that, in a country where prepaid phones dominate, there are basically two kinds of airtime buyers: those who make big infrequent purchases, filling up on minutes, and those who buy fewer minutes more regularly. Their theory is the re-fillers are richer than those who buy airtime often, and thus the average size of an airtime purchase can serve as a proxy for wealth. And indeed, the biggest average purchases, as the map below shows, happen in Abidjan, the capital; in a few cities in the interior; and around key border areas and trade routes.

Screen Shot 2013-09-26 at 6.10.39 PM

There's good reason to believe in a connection between airtime purchases and wealth. Mobile service providers throughout Africa allow their customers to transfer minutes between one another. In Côte d'Ivoire, such transfers are especially easy. The result is that airtime is used as currency in Côte d'Ivoire, Ghana, Egypt, and other countries. Airtime goes beyond being a proxy for wealth. In a sense, it is wealth.

There is a certain irony in studies such as this one. The main reason to do them is that, in countries like Côte d'Ivoire, government statistics can be spotty and unreliable. But the absence of solid statistics means the researchers have no real way of validating their results.

Still, as the map suggests, they're probably on the right track.

Jump to comments
Presented by

Ritchie King

Ritchie S. King is a reporter and visual journalist at Quartz, focusing on infographics and interactive features.

Get Today's Top Stories in Your Inbox (preview)

A Fascinating Short Film About the Multiverse

If life is a series of infinite possibilities, what does it mean to be alive?


Elsewhere on the web

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register. blog comments powered by Disqus

Video

The Death of Film

You'll never hear the whirring sound of a projector again.

Video

How to Hunt With Poison Darts

A Borneo hunter explains one of his tribe's oldest customs: the art of the blowpipe

Video

A Delightful, Pixar-Inspired Cartoon

An action figure and his reluctant sidekick trek across a kitchen in search of treasure.

Video

I Am an Undocumented Immigrant

"I look like a typical young American."

Video

Why Did I Study Physics?

Using hand-drawn cartoons to explain an academic passion

Writers

Up
Down

More in Global

Just In