The long tail of software. Millions of Markets of Dozens. "You know the real reason Excite went out of business? We couldn’t figure out how to make money from 97% of our traffic. We couldn’t figure out how to make money from the long tail – from those queries asked only once a day."
"57% of Amazon’s sales come from books you can’t even buy at a Barnes and Noble (to be fair, there is some skepticism around this number voiced here). This runs totally counter to the traditional 80/20 rule in retailing – that 80% of your sales come from 20% of your inventory. In Amazon’s case, 57% of their book revenue comes from 0% of Barnes and Nobles inventory."
"iTunes has over one million songs in it’s catalog. You know how many have been bought at least once?