Financial and insurance services are another sector watching the independence debate very carefully, because there is so much cross-border regulation and the dominant share of markets south of the border.
In addition, although the hundreds of stock markets around the world have consolidated into one or at most a handful of exchanges in each country, cross-border regulation makes it difficult for international takeovers to take place, and governments do not seem to be in any hurry to change the rules.
And misguided efforts to force them to create such cross-subsidies through regulation often create more problems than they solve.
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Outlining plans for a new Communications Bill, Mr Hunt said a cross-media approach to regulation was vital, as broadcasters, newspapers and internet companies developed new products for smartphones, tablet computers, and web TV.
The inquiry will make recommendations on media plurality, regulation and cross-media ownership by July 2012.
Prior to the establishment of CITES in 1973, there was no international regulation of the cross-border trade in wildlife.
In 2008 the EPA issued the cross-state air pollution rule to revise a 2005 regulation that had also been challenged in court.
On September 28th, the Civil Aviation Authority, the airports' regulator, is to recommend a new method of price regulation, which will end the cross-subsidy of airport charges.
What is clear that regulation will need to be as cross-border and connected as the industry it is regulating, but that finding even a common set of standards that can still allow for national implementation will be difficult enough.
Cross-party proposals for a royal charter to underpin press regulation following the Leveson report are to be delayed, Downing Street has said.
Amidst frantic manoeuvring on Thursday, the Conservatives put down amendments to the Crown and Courts Bill which would use the measure to set up the prime minister's preferred system of press regulation - paving the way for another cross-coalition confrontation of the kind first seen in January, when the two parties opposed one another over the review of parliamentary boundaries.
Mr Clegg backed a cross-party approach to setting up a new system of press regulation, saying "business as usual" was not acceptable.
But now those firms are more broadly vulnerable to both regulation and litigation when any local member firm, now part of a large cross-border group, screws up an audit.
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He stressed that the Brussels I regulation goes much further than the Hague Convention, in that it applies to all cross-border disputes, not just online cases.
The regulation pre-empts the signing of a global charter on the question of jurisdiction in cross-border online disputes, under discussion at a forum called the Hague Convention.
During his cross examination he said the matter of regulation A19 was only discussed during an item called "workforce change" - one of 11 items on the agenda.
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