Which retail strategy innovation led to the biggest revenue increase for game developers between 2015-2020?

The gaming industry has transformed retail strategies dramatically over the past decade. From physical game cartridges to digital downloads, from standalone purchases to subscription models, the way games are sold and distributed has evolved significantly. This trivia question explores a pivotal shift in gaming retail that changed how products reach consumers in the virtual world marketplace.

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Free-to-play games with in-app purchases and microtransactions
Limited-edition physical collector's editions with exclusive merchandise
Game subscription services like Xbox Game Pass and PlayStation Now
Cross-platform digital storefronts with unified accounts