You reminded me of that of the decimals, it was an old twentieth-century sales trick, it happens that they had found that the buyers who had studied in North American markets tended to consider that a price of $ 9.99 was an offer when it was a product of $ 10, so it became fashionable to place decimal prices to manipulate the minds of buyers. At least it's what I remember an old teacher told me :)
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I like the story though, thanks for sharing.