Which pricing strategy revolutionized the language learning app market when Duolingo first introduced it in 2011?

The language industry has seen remarkable innovations in retail strategies, especially in how language companies market their products and services. From translation apps to language learning platforms, companies use various pricing models to attract and retain customers. Test your knowledge about how linguistic products are priced and marketed in today's competitive landscape.

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Freemium model (basic features free, premium features paid)
Subscription-only model with tiered pricing
One-time purchase with lifetime updates
Pay-per-lesson model with micropayments