Historians cite examples of fiat currencies imploding after hyperinflation, making these worries a real concern.
This is a real concern, and one that can't be overlooked and dismissed easily.
But an outsider with a real concern for preserving the past can help overcome that problem.
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The rise in burglary is a real concern because of the traumatic effect it has on victims.
So this is a big cut and a real concern, and really no-one wants this cut to happen.
Dr Jan Wise, a consultant psychiatrist from London, said there was a real concern children were becoming hooked.
"It s a real concern that teacher vacancies continue to increase, " he said.
Muslim News editor Ahmed Versi said any incidents of trace contamination were, nevertheless, "a real concern" for the Muslim community.
Time is a real concern among medical professionals, but spending a little extra for this purpose is certainly worth it.
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And for Roger, who suffers with chronic, severe depression, becoming incapable of making good medical decisions is a real concern.
There is now a real concern that the flood has caused serious pollution to land, animals and crops near Aberystwyth.
"I think that there was always a real concern that, given the subject matter, it would never get through, " says Abbott.
But others believe that the media is voicing a real concern and that it has a duty to warn consumers and investors.
That sort of repetitive stress is a real concern for all stage actors, along with moving well and making it all look effortless.
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"It's a real concern that within the higher education sector even less goes to the front line of teaching and research, " he said.
The increase in MRSA infections in hospitals is a real concern.
There are smartphone apps that offer similar functionality, but they tend to drain a phone's battery a real concern, since a bike, unlike a car, can't recharge a phone.
Changing your footwear throughout the day is a real concern.
And, for the moment, "Dutch Disease" is a real concern: a hollowing out of Brazil's industrial sector, as the boom in commodities (plus a hugely competitive China) gradually prices them out of world markets, and the Brazilian one.
Inflation remains a real concern.
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"If you are on the board of the bank that is bidding on a multibillion-dollar banking deal, which is being financed according to Sharia law, and you sit on the board of a competitor that is also bidding, there is a real concern about insider information, " said Connolly.
How your toaster or washing machine or new car will stay on top of emerging security concerns years after initial production is a very real concern, one that Kocher, a respected cryptographer, has given some thought.
According to Mr Jones there is a "real concern and worry with parents and lack of information".
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This remains a very real concern, with much of the world suffering from increasing water scarcity, land erosion, drought intensity, stalled progress on crop productivity, declining groundwater aquifers, over-grazing of pasturelands, tropical deforestation, massive species extinction, over-fishing, and anthropogenic climate-change.
Shows a lack of real concern or effort on the part of employers in trying to control costs.
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Care services minister Norman Lamb said the rise in suicide numbers was a "very real concern" and pledged to tackle the problem "head on".
But the MP for Dover and Deal, Charlie Elphicke, described the rise in complaints as "striking" and said it's a real cause for concern.
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