But the US domestic economy is far more important for the biggest US companies than the UK domestic economy is for British firms. London competes with cities around the world. In some cases different sectors compete with different locations. The financial services and banking industry competes with New York, Frankfurt and Tokyo. New knowledge and internet-based industries compete directly with Amsterdam, San Francisco and Bangalore.
Tourism competes globally.
In other words, the prosperity of every Londoner is completely tied up with the city's role in the international economy. For this very reason, it is impossible to combine the economy of the greatest international city in the world with narrow mindedness and 'Little Englander' attitudes. London must push for the UK to join the euro as the only way to ensure it remains the financial centre of Europe. London has 25 million visitors a year. It must continue to build the tourist industry.