Since it is not practical to have a physically-backed crude oil fund, existing products rely on futures contracts to implement their strategies.
So the problem is how to facilitate this, given that it is not practical to put them in a scanner every time someone wants to ask them a question.
Hence his commission which is concluding, to no great surprise, that it is not practical simply to exclude one category of MP, the Scots, from all Parliamentary votes affecting England.
It is not a practical option to have rationing of care because there is no medical test for impotence and therefore it would be almost impossible to apply fair and consistent criteria for treatment across the board.
It is just not practical to deport 11 million undocumented immigrants living within our borders.
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In practice, this would be fine for some small countries, but it is not too practical for the world as a whole because it would require a very large amount of gold.
And open immigration is not only practical, it is actually beneficial.
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It is not obvious, given the practical and economic advantages of currency union highlighted in the report, why that would be the case, if Scotland were willing to sign up to a Treasury-style set of constraints.
While trying to automatically decipher our preferred squads from searches is nice, it might not be practical when we're just looking up information on our fantasy football players so this should be a help.
And this is not blind optimism or synthetic confidence to console people, it is the practical affirmation for our times of our faith in a better future.
For many scientists, however, it is the principle that counts, not the practical engineering.
To the contrary, they are certain to have the effect of making such a turn-around unlikely until it is still harder, if not as a practical matter impossible, to effect.
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Finally, some believe that the dictates of globalization are such that it is no longer practical, and probably not even possible, for the United States to preserve an indigenous defense industrial base.
But your business is not just a formula, nor is it simply a grade against a checklist of practical criteria.
Just because something is intrinsically good does not mean it lacks practical economic benefit.
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It is just these practical considerations which Becta did not give enough weight to.
The scandals of paedophile priests and priests with lovers and children has raised questions over just how practical celibacy is (though of course it is not celibacy in itself that makes men paedophiles).
The idea is practical since it means amending banks' debt structures, not reinventing them, although banks would need roughly to double the amount of this debt that they hold.
There are practical things to consider, such as checking it is not a duplicate and will it be easy for the emergency services, a taxi firm, or the post office to find it?
This legislation is designed to make it exceedingly difficult -- if not, as a practical matter, impossible -- to impose export controls on strategically sensitive technologies.
For it is not simply a question of intent, but rather a matter of what the practical effects of the new policy would be.
Mr Grubb shows why it is right to be concerned about such practical difficulties but also why they do not undermine the success of the Kyoto accord, which they take to be one of the great negotiating successes of the past half-century.
But as a practical matter, it is impossible for a health professional to ascertain conclusively whether or not a patient is suffering from back pains or sad feelings.
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