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Alex Bevan from the Wales TUC says there has been downward on pressure on wages, influenced by high unemployment and a growth in zero-hours contracts in recent years.
He told ITV News that "too many employers are not paying their staff a decent wage because of the economic outlook".
Workers in Wales have seen their weekly pay packet fall by an average of £32.36 between 2007 and 2012 - a greater drop in wages than any other part of the UK.
The following figures are for full-time employees, working a 40-hour week, after taking inflation into account:
- Workers in Wales were paid £32.36 less per week (in 2012, compared to 2007)
- Workers in England were paid £30.62 less per week
- Workers in Scotland were paid £21.54 less per week
- Workers in Northern Ireland were paid £24.47 less per week
- Men in Wales were paid £33.65 less per week
- Women in Wales were paid £18.83 less per week
- Flintshire has seen the biggest fall in wages - workers were paid £57 less per week
- Merthyr Tydfil is the only area where wages are up - workers were paid £0.34 more per week
The TUC says families in Wales are experiencing "a huge squeeze" on their incomes.
Its research, published today, shows wages here have fallen by 7.3 per cent since 2007.
Wages in Wales have fallen by 7.3 per cent since 2007, according to research published today by the TUC. That's worse than the UK-wide average drop of 6.3 per cent. Across Wales and the UK as a whole, men have seen their pay squeezed harder than women.
The figures compiled by the TUC show that - after taking inflation into account - weekly pay packets in Wales have fallen by an average of £32.36 since 2007.
Flintshire is the hardest hit county in Wales, where average hourly pay has fallen from £11.75 in 2007 to £10.31 last year - a 12.2 per cent real terms drop.