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One reason may be down toa lack of relevant skills. Another could be racism in the job market. Have a look at this (admittedly old) study - it makes for interesting reading:
http://news.bbc.co.uk/1/hi/uk/3885213.stm
Also, there are proportionally more ethnic minority workers in the public sector. In fiscal downturns, more blacks and Asians will find themselves out of work than whites.
In addition to this, there are a higher number of black workers in casual work (building, labouring etc) which again are hit hardest duringa recession.
What theories do you have?