Erik Brynjolfsson and Andrew McAfee published an ebook called, "Race Against The Machine: How the Digital Revolution is Accelerating Innovation, Driving Productivity, and Irreversibly Transforming Employment and the Economy." At it's essence it offers economic and technical insight into why computers and information technology are irreversibly changing the employment and economic landscape of America and the world.
In a nutshell it's message is skills and technology rules. Old school jobs for semi-skilled, high school educated people are disappearing and aren't coming back. Entry level jobs that enabled people to gain a foothold in a company and work their way up have evaporated. Mechanics need to be able to use computer diagnostics, high tech bar code readers recognize and sort package, ATMs replace bank tellers, and the nature of productivity is changing in ways we have yet to figure out. Considering that Mr. Brynjolfsson and Mr. McAgee's ebook can be downloaded via Amazon and read on all manner of digital devices replacing printers, book stores, academic journals, and the whole food chain that goes along with it is an example of the very change described in this ebook with a very long title.