What pricing strategy did publishers adopt in the 2010s that significantly boosted e-book sales for backlist literary titles?

In the world of publishing, pricing strategies can make or break a book's success. Publishers use various pricing models to maximize sales, build author brands, and respond to market conditions. This trivia question explores one of the most interesting pricing phenomena in the book industry that has revolutionized how publishers approach new releases and backlist titles.

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Dynamic pricing - automatically adjusting e-book prices based on real-time demand analytics
Temporal discounting - offering steep limited-time discounts ('price pulsing') on selected e-books to generate visibility and reviews
Premium pricing - setting higher prices for award-winning literary fiction to signal quality and prestige
Bundle pricing - selling e-books only as part of author's complete works or themed collections