The idea that guitar sales are booming is well accepted now, I think. But this article about Martin kinda blew me away with this quote;

“It’s the biggest boom I’ve ever seen with demand as high as I’ve ever known it. The world market has grown,” said Mr Martin IV..."This is bigger than the MTV Unplugged boom of the mid to late 80s, the folk rock boom of the 70s and the folk boom of the 60s,”...Martin says he is “selling more than ever” in the growing US market, indicating that growth in international sales has been even higher..."we are selling more in America than ever before...”

Much of the later part of the article discusses the environmental issue of finding quality wood for the guitars.

http://www.independent.co.uk/arts-entertainment/music/news/mumford--sons-laura-marling-and-ed-sheeran-fuel-boom-in-acoustic-guitar-purchases-8853909.html