Whitey - 4:59 am on Mar 21, 2012 (gmt 0)
The press release is here : [bcg.com...] and there's a link that takes you to the report which explains the methodology of the research.
The $4.2 Trillion Opportunity: The Internet Economy in the G-20
The Internet economy is growing more than 10 percent per year in the G-20 nations. No one—no individual, business, or government—can afford to ignore its ability to deliver more wealth to more people more broadly than any economic development since the Industrial Revolution. This report quantifies the Internet’s economic impact.