Mr Connor says he and his co-authors believe this is another serious source of potential instability.
But VAT is not the only source of potential discomfort in Lib Dem ranks, or possibly between Lib Dem ministers and their grassroots members.
Also seeing more and more people use Graph Search for dating purposes because friends of friends tend to be a good source of potential dates.
For one group of would-be GOP candidates, the '98 results will be more important as a source of potential bragging rights than for anything else.
"Investor sentiment is likely to weaken considerably as an important source of potential inflows has likely been plugged, " said Rajeev Malik, an economist at the firm.
And banks are not the only source of potential trouble: AIG, a big American insurer, had to be bailed out shortly after the collapse of Lehman Brothers in September 2008.
As an alternative, the company has already spent time looking into the possibility of licensing its gyroscope technology, which keeps the two-wheeler from tipping, to car companies as one source of potential revenue.
"The proliferation of organizations with overlapping oversight and assistance responsibilities is a source of potential confusion among agency personnel and may be an inefficient use of scarce technical resources, " said Jack Brock, director of governmentwide and defense information systems at the General Accounting Office, speaking before Congress in February.
Whatever happens in the House, the Senate will be the likely source of any potential compromise.
He noted that mobile phones were only one potential source of boorish behaviour in the theatre.
Asset management is another potential source of income growth, but Chinese banks have work to do in that area.
They may also ignore non-customers (who are the biggest potential source of growth) and the elderly (who seldom tweet).
Some humanitarian experts have given warning that these people will remain a potential source of destabilisation unless they are rehabilitated.
However, McCue says products on Flipboard are a potential source of revenue.
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Successful people will likely pay a large part of the price, as they are the largest potential source of additional government revenue.
Many venture capitalists and investment bankers see a carbon-trading regime and massive subsidies for renewable energy as a potential source of windfall profits.
It is true that Kazakhstan is potentially an alternative energy provider but in ten years' time it will probably still be only a potential source.
That leaves businesses as the last potential source of continued growth.
For Europe, it is an important potential source of non-Russian gas.
Government debt has soared since the start of the decade, creating a potential source of trouble when the next recession hits tax revenues (see chart).
One potential source of trouble for Wal-Mart is global expansion.
D-mark, robbing bond investors of another potential source of profits.
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Down the road, Canada remains important to GM as a potential source of bond investors because its economy is growing faster than the U.S., and its dollar is strong.
Ginsburg brought up one potential source of future controversy.
Popular in this corner of southeastern Massachusetts, yo-yoing is reviled by many sports anglers as unsportsmanlike and a potential source of toxic lead contamination to the fish -- and the people who eat them.
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Speaking for the Scottish Chambers of Commerce, Mr Clark said corporation tax on its own "produced volatile returns", but agreed the tax was a "potential source for benefit for businesses in the long term".
Sharing alcohol is a potential source of conflict.
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It's a tantalizing prospect: Based on an estimate of the number of rivers around the world with suitable conditions, it's a potential source of 1, 700 terawatt hours a year of energy globally, according to estimates by Statkraft's scientists.
For those who have lost their job or are having a hard time entering the U.S. workforce to begin with, one potential source of help is an employment service, a company that works to place applicants with appropriate employers.
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