Which pricing innovation did Rosetta Stone pioneer that changed the language learning product market?

In the language learning and linguistics product market, pricing strategies often reflect unique psychological and cultural factors. This trivia question explores how language product companies have innovated in their pricing approaches to capture market share and appeal to different segments of language learners. Test your knowledge about a fascinating pricing strategy that revolutionized how language learning products are sold globally.

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Tiered subscription model based on language difficulty levels
Lifetime access licenses with graduated pricing based on number of languages
Pay-per-word mastered system with algorithmic pricing
Regional pricing adjusted to local linguistic proximity