Recent Thread here
https://www.reddit.com/r/Bitcoin/comments/3x8ba9/bitcoins_metcalfes_law_relationship_between/
way back in 2014 by Vinny
https://medium.com/@vinnylingham/bitcoin-rising-22ba09c1b078#.wz9e9cd4w
BitFury - assumptions take this further into IoT landscape
http://bitfury.com/content ...