In retail linguistics, what is the 'Diderot Effect' named after 18th-century French philosopher Denis Diderot?

In retail psychology and linguistic marketing, certain concepts have profound impacts on consumer behavior and language. The way products are named, marketed, and positioned often relies on sophisticated linguistic principles. This trivia question explores an interesting retail psychology concept that has influenced modern marketing language and consumer behavior patterns.

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The tendency to buy matching items after purchasing something new (creating a cascade of purchases because existing possessions now seem inadequate)
The psychological impact of using foreign language terms in product naming to increase perceived value
The retail practice of placing complementary products near each other to trigger linguistic associations
The phenomenon where consumers trust product descriptions with more complex vocabulary and sentence structures