The movement of goods across frontiers should become easier, and queues at the borders should disappear.

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But the problem should disappear with the integration of the world's stock exchanges.

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Videos sent via smartphone app Snapchat - which should disappear after a few seconds - can be preserved with easy to find tools.

BBC: Bug reveals 'deleted' Snapchat videos

Another 2.7% is the cyclical deficit, which should disappear of its own accord as the economy recovers boosting tax revenues and reducing unemployment benefit payments.

BBC: The Budget in numbers

But many should disappear forever.

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Since a price must be paid for prejudice, many economists have suggested (though Mr Becker's own model does not necessarily imply this) that in fully competitive markets discrimination should eventually disappear, because prejudiced firms will fail.

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Those on the ground should see the sun disappear for only a few minutes.

CNN: Africa awaits total eclipse of the sun

Without federal regulation, it is a sure thing that the insurance companies would follow a similar pattern should restrictions on cross-state sales disappear.

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The evidence shows they should take special care of their computers, iPods and other gadgets that sometimes disappear from unlocked dorm rooms.

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Such disagreements won't disappear, any more than we've seen the end of debates about whether bars should open on Sundays.

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