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> It denies the possibility that there is no effect.

"No effect" could be interpreted as the null effect, which is covered by "unknown effect".



Technically yes, but that isn't how they mean it to be read, and that isn't how readers will read it.


It's exactly how I read it, and it seems others too.

It makes no sense to assert "there absolutely was an effect; we just don't know what it is". Unless you're a trader dealing in long straddles.




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