The Office for National Statistics (ONS) has released a report showing the nature and extent of so-called "under-employment".
This situation defined as where someone wants to work more hours than is usual or stated in their contract - that is usually up to 48 hours.
The report considers how underemployment has changed since before the economic crisis, plus which groups of people are most likely to be underemployed and what jobs tend to be the most underemployed.
The BBC's economics editor Stephanie Flanders explained to Today presenter James Naughtie this partly explains why there have been "more people working" while the economy is "not getting bigger".
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