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,” Forbes.com, August 11, 2014, http://www.forbes.com/sites/peterdiamandis/2014/08/11/top-10-reasons-drones-are-disruptive/

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, http://www.marketsandmarkets.com/PressReleases/commercial-drones.asp

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, http://www.project-syndicate.org/commentary/drones-africa-development-by-j-m-ledgard-and-scott-macmillan-2015-06

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, https://medium.com/@eternaut/build-cargo-drones-get-rich-9b858dffaba

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, http://www.futuristspeaker.com/2015/06/engineering-the-secret-engines-of-off-grid-living/