Which linguistic feature on product packaging has been proven to increase perceived value by an average of 13% according to a 2022 Journal of Psycholinguistics study?

In the world of language and linguistics, product packaging plays a crucial psychological role in consumer behavior. Beyond aesthetics, the words, phrases, and linguistic elements used on packaging directly influence purchase decisions. This poll tests your knowledge about a fascinating linguistic phenomenon in product packaging that has been extensively studied by psycholinguists and marketing researchers.

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Foreign language expressions (e.g., 'le parfum' instead of 'perfume')
Phonetic symmetry in brand names (repeated sounds like 'Coca-Cola')
Scientific terminology (e.g., 'clinically proven' or 'patented formula')
Minimalist text with increased negative space