Which pricing strategy was pioneered by Amazon for Kindle books that fundamentally changed the economics of digital publishing?

In the competitive world of publishing, pricing strategies can make or break a book's success. Publishers and authors carefully balance perceived value, market positioning, and reader psychology when setting prices. This trivia explores one of the most successful pricing innovations that revolutionized book sales in the early 21st century. Test your knowledge about the business side of literature and see if you can identify the groundbreaking pricing approach that transformed an entire industry segment.

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$9.99 price point - establishing a psychological pricing threshold that created mass market expectations
Variable time-based pricing - where new releases cost more and gradually decrease in price over predetermined intervals
Reader loyalty pricing - offering discounted books based on the number of previous purchases from the same author
Subscription bundling - where individual book prices were calculated based on anticipated subscription revenue