Restricting online access: what evidence do publishers have to support their claims that open access negatively affects sales?

Via Scoop.it – More … or less!
“Aside from wider public impact, there’s the (to me, more important) issue of specifically academic impact and influence. I’m pretty sure that the disappointingly minor impact that my first monograph has so far made (given its novel claims, wide material base, and original methodological take) is because there is no electronically searchable version of it available.”
Via blogs.lse.ac.uk