Well, I think the best example of how racism impacted the Younger family beneficially is when we think of how Lindner's offer is rejected by Walter at the end of the play, and how ironically, this example of racism gives him the opportunity to finally become the man that he has always talked about being, even though he has just found out that he has lost all of the money he invested in a foolish venture. Note what he says to Lindner:
And we have decided to move into our house because my father--my father--he earned it for us brick by brick. We don't want to make no trouble for nobody or fight no causes, and we will try to be good neighbours. And that's all we got to say about that. We don't want your money.
Even though Walter has just lost a lot of money, he, through the racism that is expressd in Lindner's offer, is able to unite the family and bring them together, in spite of all of the different pressures that they face and threaten to tear them apart. Ironically, Lindner through his offer has actually proved to be the catalyst that has helped the Younger family bond together and has ensured that they will move into the neighbourhood.