With a particularly light week after Christmas (perhaps because of those post-holiday ebook downloads), unit sales of print books as measured by Nielsen Bookscan declined 9.25 percent for 2011. At 651 million units, the total was 66.3 million units lower than the total for 2010. (Remember our point from earlier in the week: BookStats counted trade ebook sales in 2011 of 76 million units. If that number doubled or more in 2011, the ebook gain could meet or exceed the decline in print units measured by Nielsen Bookscan.) Trade paperback sales, by far the largest category, declined 6 percent, at […]