The US economy last year recorded its lowest rate of labour productivity growth in more than a decade, with growth in output per hour worked falling behind the EU and Japan. The fall casts further doubt on the ability of the Federal Reserve to cut interest rates as the US economy slows.

Research to be published on Tuesday by the Conference Board, the international business organisation, shows that US labour productivity in the whole economy grew by 1.4 per cent in 2006 as slower economic growth was combined with a rapid rise in employment.