This Metafilter Post points to Diverting the Amazon. "And this is where Hugh Howey had a stroke of genius. He has effectively redefined the 99c price point, reinventing it as the region of high-quality short stories/novellas. His Wool series is essentially a series of related short stories, longer than chapters, but not full books in their own right. They are a return to the spirit of pulp fiction in the 1950s, engaging stories that can be read in a single setting and continued if the reader chooses to buy the next one in the series. Howey has been criticised for short-changing readers, as he doesn’t describe these books as short stories with roughly 20-25,000 words a piece, but he points out that if someone purchases all five novellas they will have spent 4.95 on 100,000 words, a fair price by anyone’s estimate."