However, what is objectionable is wrongful discrimination. Distinguishing wrongful from innocent discrimination is tricky (Alexander 1992). Statistical discrimination is not per se wrong. A black man may correctly perceive black skin to be roughly correlated with traits such as common experiences and outlook that he values in friends, and prefer blacks as friends on this basis. This is surely not morally wrong. Nor would it be wrong to desire on the same basis to be employed in a firm that employs mainly blacks. It might well be the case, however, that acting on such a desire in concert with others might have significant negative consequences for others. Heterosexuals flocking together in the workplace might tend sharply to limit employment opportunities available to nonheterosexuals. On grounds of equal opportunity, then, law and social custom might be framed to restrict or prohibit acting on the desire to club together with others whom one identifies as like oneself in certain salient ways, even though this sort of discrimination is not deemed per se wrong.