Rates are measured differently in different countries
For the fourth quarter of 2004, according to OECD, (source Employment Outlook 2005 ISBN 92-64-01045-9), normalized unemployment for men aged 25 to 54 was 4.6% in the USA and 7.4% in France. At the same time and for the same population the employment rate (number of workers divided by population) was 86.3% in the U.S. and 86.7% in France.
This example shows that the unemployment rate is 60% higher in France than in the USA, yet more people in this demographic are working in France than in the USA, which is counterintuitive if it is expected that the unemployment rate reflects the health of the labor market.
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