THE two days of rioting by blacks in Miami during May 1980 has helped to imprint on the nation the considerable poverty that still engulfs a significant segment of black Americans. What’s more, those blacks who have come out of the 1960’s and 1970’s poverty ridden are more likely to pass on this awful plight to their offspring-offspring who, owing to inadequate schools, poor school performance, excessively high unemployment, low skills, and attendant social pathologies, have little opportunity to put the poverty of their parents behind them.