Is this what is meant by "institutionalised racism"?

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In the local supermarkets round here and near work, most of the people who are behind the checkouts seem to be from minority-ethnic backgrounds, while those who are the customers appear to be from either white or irrestective of ethnicity, from affluent backgrounds. Looking around at who seemed to be in supervisory/managerial roles, most of them seemed to be from a white background. There's something that just doesn't feel right about it all -in a society of "equality of opportunities" I would have thought that there would be diversity in front of and behind the tills, and upstairs in the office too. This then made me wonder whether firms and employers that have a large compliment of shopfloor staff from "BME" ethnicities are unconsciously holding back the ambitions and aspirations of those of us from such backgrounds by not having a clear path for those with the potential to rise up through their firms, by failing to ensure that they invest in their staff and by failing to encourage their staff to move up through the system. Comments?