LAST WEDNESDAY, Facebook announced its plans to purchase WhatsApp, a messaging app with 450 million users, for $19 billion.

$19 billion is a lot of money. If it’s hard for you to wrap your brain around that price tag, here’s a map to help. The countries in green have annual GDPs worth less than the price paid for an app that lets you text your friends. Hover over any of the countries in green to see their 2012 GDP (in billions).