Murchinson is a very wealthy, college educated black man from a well to do family. He is courting Beneatha, and her entire family encourages her to marry him for financial stability. Beneatha refuses because he is too "snobby." This snobbiness is a result of his desire to not be seen as a poor, lower class black, and therefore gain attention and acceptance from whites. Because, despite his wealth and education, he was still discriminated against for his skin color. This shows the importance of not just degree of wealth or education in social class, but also biological luck. And unfortunately, it is hard to be of a high social class with black skin.