Generation Y, those born between 1979 and 1989, spent the most money on books in 2011, taking over long-held book-buying leadership from baby boomers, according to the 2012 U.S. Book Consumer Demographics and Buying Behaviors Annual Review. The Review notes that GenY's 2011 book expenditures rose to 30 percent -- up from 24 percent in 2010 – passing Boomers' 25 percent share. And with 43 percent of GenY's purchases going to online channels, they are adding momentum to the industry shift to digital.