Which pricing strategy did major book publishers adopt in the early 2010s that led to a legal battle with Amazon and dramatically changed e-book pricing?

In the publishing world, pricing strategies can make or break a book's success. Publishers carefully balance accessibility with profitability, while considering the unique aspects of literary works. This trivia question explores a fascinating pricing phenomenon that has shaped how readers discover and purchase literature. Test your knowledge of the business side of arts and literature!

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Agency Model - where publishers set final retail prices and retailers take a commission
Wholesale Model - where retailers purchase books at wholesale prices and set their own retail prices
Dynamic Pricing - where e-book prices fluctuate based on real-time consumer demand
Subscription Model - where readers pay monthly fees for unlimited access to publisher catalogs