The following sources were cited in SAP Digital Futures Issue 03: Drones: Tomorrow’s “I” in the Sky

The first GPS receiver weighed 50 pounds and cost more than US$100,000. Today,  a 0.3-gram GPS chip costs less than US$5.
Peter Diamandis, “Top 10 Reasons Drones Are Disruptive,”, August 11, 2014,

The global market for commercial drones will rise from US$15.22M in 2014 to US$1.27B in 2020.  This is a tripling every 18 months – faster than even Moore’s Law.
UAV Drone Market for Commercial Worth $1.27 Billion by 2020, MarketsandMarkets, February, 2015,

800 million people worldwide have limited access to emergency services due to weak transportation infrastructure.
J.M. Ledgard and Scott MacMillan, “Drones for Development,” Project Syndicate, June 5, 2015,

Cargo drones could turbocharge economic development in Africa, where only 16% of roads are paved.
J. M. Ledgard, “Better Use of the Lower Sky in a Sharing Economy,” Medium, September 23, 2014,

Solar-powered drones will provide Internet, Wi-Fi, and telecom services to people in remote places on earth.
Thomas Frey, “Engineering the Secret Engines of Off-Grid Living,” Futurist Speaker, June 24, 2015,