The days when a single Kindle Daily Deal could catapult an unknown book up the New York Times bestseller list are probably behind us now. And big publishers are experimenting more and more with price promotions, so that a super-low price on a self-published ebook isn’t enough to help it stand apart. So as more and more and more ebooks are published, how have the mechanics of price promotions changed?

I moderated a panel on this topic at the Digital Book World conference last month. I learned a ton in interviews with my panelists and we weren’t able to get to all of it during the conference. Here are some of their most intriguing points and lessons learned.

It’s all about the shopping cart

The “cart” is an obvious feature of online shopping — but hasn’t always been a huge part of shopping for ebooks. If you’re reading on an…