Mobile App Economy - $27 Billion in 2013, $76 Billion in 2017

We spotted some interesting numbers today, that serve as 'size digests' - the mobile app economy had a revenue number north of 27 billion dollars in 2013, and is projected to grow to some 76 billion dollars in 2017 (Source)

Bonus stat: Apple reported $9.3 billion in revenue last year from its iTunes store, which sells apps along with music, movies and electronic books. (Source)