Which pricing presentation technique, based on linguistic psychology, has been shown to increase conversion rates by up to 30% for premium language learning subscriptions?

In the world of language learning products and linguistic services, pricing strategies often incorporate fascinating psychological elements. Many language learning apps and translation services use specific pricing tactics that leverage how our brains process numerical information. This poll tests your knowledge of a particularly effective pricing strategy used in language learning subscriptions that relies on cognitive linguistics principles.

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Charm pricing (using prices ending in 9 or 99, like $19.99 instead of $20)
Linguistic fluency anchoring (showing the price per day rather than monthly total, e.g., 'Less than $1 per day')
Bundle pricing (offering tiered packages with multiple language options at increasing price points)
Prestige pricing (intentionally pricing higher than competitors to signal quality)