Yes, 5% doesn't seem like much compared to the exponential growth we've seen in recent years. But let's get some context here. First, here's another way of showing the exact same data in Carr's chart:
Also, here's what both graphs ignore: E-book sales were up 5% at a time when overall trade sales were down nearly 5%. In other words, e-books were still a growing format despite an overall sales decline. In the adult trade market they were up 13.6% at a time when hardcovers were down 0.6% and paperbacks up just 1.7%.
And for the first time ever in Q1 e-books are now the leading format in the adult market, even more than paperback (note: percentages don't add up to 100% because I'm just including the three largest formats):
Hardcover: $226.5 million (22% of the adult market)
Paperback: $306.6 million (30% of the adult market)
E-books: $328.2 million (33% of the adult market)
In fact, when you compare the share of market over the past few years you see a pretty consistent pattern.
E-book market share in the adult market:
23% in Q1 2011
28% in Q1 2012
33% in Q1 2013
This directly contradicts Neil Irwin's assertion that "the ratio of printed books sold to electronic books is going to stabilize at a higher level than it had seemed likely a year or two ago," particularly when you factor in the fact that e-books have lower price points and yet are generating more revenue.
Everyone needs to stop fixating on YOY percentage growth. Even at a steady rate of overall growth, percentage growth inevitably goes down because it's starting from a bigger base. It's simple math. If you keep increasing your sales at the exact same rate, eventually your percentage growth will fall to zero even though your sales are steadily going up.
And, lastly, as author David Gaughran often points out, the AAP stats don't include self-published e-books, which make up a substantial portion of the market, including at least 25% of B&N's Nook sales.
Let's stop philosophizing about how people just don't like e-books very much or only like them in certain contexts or for certain genres or all the people who will convert have already done so.
E-books have never been on pace to rout the print market all at once. It's always been a steady march, and it's one that's continuing.
CORRECTION: The original version of this blog post attributed the Washington Post Wonkblog article to Ezra Klein, but it was actually written by Neil Irwin. Klein is the editor of Wonkblog. Sorry about that!