Which linguistic pricing strategy has research shown to be most effective for premium products in luxury retail?

In the world of retail pricing strategies, linguistic choices can significantly influence consumer perception and purchase decisions. Certain price endings, descriptive terms, and presentation formats trigger specific psychological responses. This trivia question explores how language intersects with pricing psychology in the retail environment. Can you identify which linguistic pricing tactic has been proven most effective in premium product marketing?

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Precise pricing with non-rounded numbers (e.g., $1,995 instead of $2,000)
Phonetic symbolism pricing (using prices with softer-sounding digits for luxury goods)
Dropping the currency symbol and decimal points (e.g., 2000 instead of $2,000.00)
Charm pricing with prices ending in .99 or .95