The following sources were cited in SAP Digital Futures Issue 04: Makers Shake Up Manufacturing

The 3D printing market will quadruple to US$12 billion by 2025.
“3D Printing Market to Quadruple to $12 Billion in 2025” [press release], Lux Research, April 29, 2014,

In 2006 the San Francisco MakerFaire attracted 65,000 enthusiasts. Last year 130,000 attended, and another 85,000 attended in New York.
Maker Faire: A Bit of History,”, accessed August 11, 2015,

“Media Kit & Press Resources,”, accessed August 11, 2015,

Today, there are 1,100 hackerspaces around the world giving people access to production tools once available only to corporations.
“List of Hacker Spaces,”, accessed August 11, 2015,

Peer-to-peer e-commerce site Etsy’s revenue nearly quadrupled in only 4 years − from US$525 million in 2011 to US$1.9 billion in 2014.
Ruth Reader, “Etsy Starts Trading on the Nasdaq at $31 per Share — Nearly Double Its Original Price,” VentureBeat, April 16, 2015,

Crowdfunding campaigns generated US$11.08 billion in 2014. The market will grow to US$93 billion by 2025.
Katie Kuehner-Hebert, “Crowdfunding Volumes Grow to $16B”,, April 2, 2015,

Crowdfunding’s Potential for the Developing World (Washington, DC: infoDev, Finance and Private Sector Development Department, The World Bank, 2013),