The research looked at 7,000 UK-based firms and compared productivity between those that are UK owned and those that are US owned.
It found that output per employee in US owned firms is 40 per cent higher than their UK owned counterparts, and that the spending on IT is 17 per cent higher.
The LSE estimates that 80 per cent of the difference in productivity is a result of the use of computers.
US companies are also managed differently from non-US firms, with more aggressive HR practices that promote good performers more quickly, and greater devolution of responsibility for departmental IT resources.
The retail, wholesale and finance sectors were most likely to demonstrate these trends.
US output per hour grew 2.5 per cent a year on average between 1995 and 2004 compared with 1.5 per cent across the EU.
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