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			 The capital of euro trading prospers outside the euro zone, but 
			London's dominance of the $5.3 trillion-a-day foreign exchange 
			market could wane if Britain left the European Union. 
			 
			While British leaders have long resisted replacing pounds with 
			euros, traders in the City of London financial center now buy and 
			sell more than twice as many euros as the whole 19-member euro zone 
			and more dollars than the United States. 
			 
			For four decades, London has been the undisputed king of foreign 
			exchange, but some investors fear that if British voters decide to 
			leave the EU, the City would eventually lose its top position, 
			especially in euro trading. 
			 
			"If the UK left the European Union, London's dominance of foreign 
			exchange including euro trading would gradually decline and then end 
			as the flows moved to Asia and other European capitals," U.S. 
			investor Jim Rogers, who co-founded the Quantum Fund in 1973 with 
			George Soros, told Reuters. 
			 
			"London's dominance of the foreign exchange market evolved 
			historically but evolution will continue in other places if the UK 
			leaves. It would be foolish to leave the EU, but politicians have 
			done foolish things since the beginning of time." 
			 
			Twelve years after Rogers left Quantum in 1980, Soros used the fund 
			to bet successfully that sterling was overvalued against the 
			Deutsche Mark, culminating in Britain's biggest financial 
			humiliation since the sterling crisis of 1976. 
			
			  
			On so called 'Black Wednesday', Sept. 16, 1992, Prime Minister John 
			Major was forced to pull sterling out of the European Exchange Rate 
			Mechanism (ERM), which had been intended to reduce exchange rate 
			fluctuations ahead of monetary union. 
			 
			Fast forward two decades: European efforts to forge an enduring 
			monetary union are at the center of a debate within the London elite 
			about post-imperial Britain's place in Europe and whether it might 
			not be worth striking out alone. 
			 
			The shadow of the euro falls across Prime Minister David Cameron's 
			attempt to renegotiate Britain's relationship with Europe, then hold 
			a referendum on membership by the end of 2017. 
			 
			'KING OF FOREX' 
			 
			Sold sedately for centuries at the Royal Exchange opposite the Bank 
			of England, foreign exchange is now traded at high speed among 
			mostly foreign banks such as Citi <C.N>, Deutsche Bank <DBKGn.DE>, 
			Barclays <BARC.L>, JPMorgan <JPM.N> and UBS <UBSG.VX>. 
			 
			London accounts for 41 percent of global foreign exchange turnover, 
			more than double the nearest competitor, New York, according to the 
			Bank for International Settlements. London's closest European 
			competitors are Switzerland and Paris, which each take about 3 
			percent of global foreign exchange turnover. 
			 
			Yet London wasn't always king of forex: The hegemony of the pound 
			sterling in the British empire meant that before 1914, London played 
			second fiddle in forex to Paris, Vienna, Berlin and New York. 
			 
			And London's rise was partly due to good fortune. 
			 
			As the center for global dollar trading, it benefited from the 
			greenback's rise. The growth of international banking during the 
			1950s and 1960s put it in pole position to benefit from the foreign 
			exchange trading boom when floating exchange rates were adopted in 
			the early 1970s. 
			 
			Since UK exchange controls were scrapped in 1979, London has thrived 
			as a center for everything from foreign exchange and bonds to 
			derivatives and fund management, making it the largest net exporter 
			of financial services in the world. 
			  
			  
			 
			By the end of that decade Britain was top, and its dominance has 
			strengthened ever since. Though the euro's introduction reduced the 
			number of currencies traded, London emerged as the global center for 
			the most traded currency pair, EUR/USD. 
			 
			"If Britain left the EU, that trade is gone," said one senior 
			European diplomat, waving his hand. "The first thing Berlin and 
			Paris would do is to sit down and say: 'How do we bring that 
			business back?'" 
			 
			'TREASURE ISLAND' 
			 
			London offers by far the deepest pool of capital in the time zone 
			between Asia and the United States, but also a feast for the global 
			merchant: property rights, a small army of lawyers and accountants, 
			luxury property and shopping, quality private education and a wider 
			cultural renaissance unmatched in Europe. 
			 
			To be sure, London's trading cables and wider pull, combined with 
			institutional inertia, mean that any shift to the continent after a 
			so-called "Brexit" would be gradual. 
			 
			"The wires that make the trading of FX electronic are all in London 
			and so a quick move from the UK to Europe would require 
			infrastructure spending," said Robert Savage, the CEO of CC Track 
			Solutions, a New York-based hedge fund with $100 million under 
			management. 
			 
			But over the longer term, he sees foreign exchange trading moving 
			away from London and Europe if Britain leaves the EU. 
			
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			"The volume of business in FX is likely to shift from the EU and UK 
			to the U.S. and Asia," Savage said. "Big picture, the flow of 
			capital is the driver of FX markets and the Asian centers are on the 
			rise." 
			 
			Britain's allies say leaving the world's biggest trading bloc would 
			be foolhardy, leaving London's financial powerhouse subject to rules 
			it would no longer influence and turning it into an insignificant 
			offshore 'Treasure Island'. 
			 
			Opponents of the EU say London would thrive outside. They note that 
			doomsters cried wolf in the 1990s, warning that London would wither 
			as a financial center if Britain didn't dump sterling and join the 
			euro. That did not come to pass. 
			 
			For Eurosceptics, the five-year euro zone debt crisis and Greece's 
			near bankruptcy are evidence of a flawed monetary union that is 
			doomed unless it integrates more deeply, a step that would consign 
			Britain to the sidelines. 
  
			"REMORSELESS LOGIC" 
			 
			Cameron had a front row seat for Black Wednesday as a 25-year-old 
			adviser to Britain's then finance minister, Norman Lamont. He has 
			promised to keep Britain out of the euro forever, and few British 
			voters would countenance dropping sterling. 
			 
			That leaves Britain firmly outside the increasingly influential 
			19-nation euro zone core of the broader 28-member EU. Greece's fate 
			was determined by Germany and France, not Britain, which has refused 
			to contribute to any fresh bailout. 
			 
			Cameron is now set on defending the City from what his finance 
			minister calls the 'remorseless logic' of euro zone integration. 
			 
			"We, almost alone among the non-euro members, have no commitment to 
			join the single currency – and no realistic prospect of wanting to 
			do so," that most powerful minister, George Osborne, told London 
			financiers last month. 
			Osborne, who is Cameron's heir apparent, said Britain wants 
			"fairness between the euro-ins and the euro-outs enshrined, and the 
			integrity of the single market preserved". 
			 
			Euro zone rules must not hurt British interests, he said. 
			
			  
			 
			The government's worry is that Britain may eventually be one of the 
			only EU members outside the euro. It can already be outvoted on 
			regulatory issues by the euro zone if all 19 members vote together 
			as a bloc, which they rarely do. 
			 
			The risk was underlined by an attempt by the European Central Bank 
			to force clearing houses for major euro assets to relocate from 
			London to the euro zone. 
			 
			Britain challenged the ECB, and the EU's Luxembourg-based General 
			Court ruled in March that the central bank did not have the 
			'competence' to impose such a requirement. Things might look 
			different if Britain were no longer an EU member. 
			 
			"LEFT BEHIND"? 
			Since joining the European Economic Community in 1973, British 
			leaders have repeatedly underestimated the political will for 
			European monetary union that led to the birth of the euro on the 
			stroke of midnight heralding 1999. 
			 
			When the Berlin Wall fell in 1989, Margaret Thatcher opposed the 
			French idea that a common currency was the best way to tether a 
			united Germany to Europe, though she eventually signed Britain up to 
			the ERM in October 1990. 
			 
			She was deposed the following month, after her finance minister, 
			Geoffrey Howe, resigned with a stark warning that Britain risked 
			being "left behind" on monetary union. 
			 
			Thatcher's successor, Major, declared "game, set and match for 
			Britain" after securing the right to opt out of a single currency at 
			the 1991 Maastricht summit - less than a year before Black 
			Wednesday. 
			 
			When Tony Blair won the 1997 election, his finance minister, Gordon 
			Brown, effectively ruled out euro entry by setting out five economic 
			tests that had been worked out with his top aide, Ed Balls, in a New 
			York taxi. 
			  
			
			  
			 
			How long Britain can sustain its balancing act of profiting from 
			euro trading while staying out of the currency may depend on the 
			outcome of Cameron's referendum. 
			 
			(Editing by Paul Taylor) 
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