An estimated 100,000 Poles and other people from eastern Europe are working in the Netherlands this year, according to research by the social affairs ministry.
Around 25% are self-employed, and around 50% of the rest work via temporary employment agencies, the research shows.
Most are working in jobs that the Dutch are unwilling to do such as farm labouring, building and meat processing, a spokesman for social affairs minister Piet Hein Donner told news agency ANP.
Donner is to hold talks with officials from Rotterdam, Amsterdam, Utrecht and The Hague to discuss problems with housing the influx of eastern European workers.
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