Which pricing innovation by Duolingo revolutionized the language learning app market?

The pricing of language technology products has evolved dramatically over the decades, reflecting changes in both technological capabilities and market demands. From early machine translation systems that cost millions to today's subscription models, pricing strategies in language tech reveal fascinating insights about how the industry values linguistic capabilities. This trivia tests your knowledge about a pivotal moment in language technology pricing that changed consumer access forever.

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Freemium model with ad support, making basic language learning free for all users
Pay-per-lesson model allowing users to purchase only specific language units they needed
Tiered subscription based on language difficulty levels (easier languages cost less)
Peer-to-peer pricing where users earned credits by teaching others their native language