Why the unicorns are dying

By Alex Pollak
Updated December 1 2015 - 8:13am, first published 7:32am
The tide might be turning for billion-dollar start-ups. Photo: act\ian.warden
The tide might be turning for billion-dollar start-ups. Photo: act\ian.warden

Some of the big names in global disruption have been jolted by a series of write-downs, disappointing listings and even accounting irregularities over the past month as investors start to question the business models of the "unicorns" – start-ups valued at more than $1 billion.