The Economist article on the April 30th Joseph Rowntree Foundation report into the link between ethnicity and poverty chose to focus on the decision whether to be employed or work for oneself, although it did not make any assertions about the link, if it exists, between self employment and poverty, only noting that in contrast to America, in Britain graduates consider self-employment as the last resort for dimwits, which I suppose may account for my perception that after my Oxford/INSEAD education, my parents think my self employed status is somewhat shaming.
Parental influence may be the key here. It is well known that Chinese parents and Indian parents are keen on their children becoming doctors, accountants or lawyers, which may be why the percentage of self employed Chinese and Indian origin British has fallen over the past 15 years. Zia Haider Rahman points to parental influence for Bangladeshi origin people too. Having lived and been politically active in Bethnal Green for five years or so myself, I agree with his comment that the persistence of poverty is no surprise to those who have been involved in the civic life in such communities. His point about the influence of Sylheti history and cultural background is key too. He says:
"But what distresses me the most is not the material deprivation but the lack of aspirations that parents in this community have for their children. This lack of aspiration is not just a consequence of poverty, though poverty certainly doesn't help, but is actually embedded in the culture of many East End Bangladeshis."
White parents can be prone to this too though, particularly with regards to educational aspirations. I remember a boy at my state grammar school who was certainly bright enough to stay on for A levels, as the teachers wanted him to, announcing that he couldn't because his father would not support him, and wanted him to help out and then take over the family ironmongers.