Two reasons: U.S. tax rates are historically low, and taxes are a residual effect, not a causal effect, of economic activity.
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Prof Paul Pharoah, from the University of Cambridge, said the fact the risk did not increase with increasing amounts of night shifts suggests the link seen may not be causal.
First, as Dr. Goodall makes pains to point out, this study does not advocate a causal association between physician-led hospitals and their performance.
Venables: Your press statement on Dec. 19 appears to suggest there is already a link between video games and aggression, when academic studies have not demonstrated any causal connection with solid, scientific data.
This is not the sole causal relationship, however.
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It could be, but the Taiyuan factory is large and makes many things, both electronic and automotive, so what we know now is that these two things are adjacent to eachother, not that there is any causal connection.
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The researchers said although a causal effect could not be proven, the way they had done the study strongly suggested that it was exposure to alcohol in the womb that was responsible for the differences in child IQ.
The study does not explain the connection or show a causal relationship, he said.
This provides causal evidence that illusions represent not the world as it is, but what proved useful to see in one's past interactions with the sources of retinal images.
None of them has demonstrated a causal link, but it is not implausible that companies will benefit from a more diverse workforce with a broader set of ideas.
Finally, the causal mechanism petitioners proposed would produce, not ASD, but neuronal death, and eventually patient death as well.
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He did not back some of her other conclusions, such as a possible causal link between official information and the eventual losses that workers have incurred.
He pleaded guilty to dangerous driving but did not face the more serious charge of causing death by dangerous driving because no causal link could be established between his texts and the crash.
But the idea of "causal entropy" goes further, suggesting that a given physical system not only maximises the entropy within its current conditions, but that it reaches a state that will allow it more entropy - in a real sense, more options - in the future.
The Medicines and Healthcare Products Regulatory Agency currently advises that there is insufficient evidence of a causal link between the drug and suicidal behaviour, although it now says it should not be given to children.
As is usually the case in studies of this sort, the sample size was small (and therefore not as robust as might be desirable) and the result showed an association, rather than a definite, causal relationship.
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