Why are so many things 99.9% effective? Why not 98.9%?
In: Other
If you claim your product is 100% effective, then you might be in legal trouble if someone can find any case where it wasn’t effective. Making something absolutely perfect is basically impossible.
“99.9% effective” is as close as you can get to saying 100% effective without putting yourself in legal trouble, so that’s what they go for.
98.9% effective sounds worse, so nobody’s going to say that
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