why is the ending scene appropriate to the younger family and mama

Even though their goals are very different in nature, the insurance money from Walter Sr. is the catalyst for each of their dreams. The $10,000 offers the Youngers the ability to achieve salvation: Mama will get her dream home, Beneatha her medical education, and Walter his liquor store. However, the money comes at a price: Walter Sr. must die for the Youngers to have any chance of getting out of their futile situation. In many ways, the insurance money acts as a deus ex machina. The term is used in reference to a trope in ancient Greek plays when a character doomed to die is miraculously saved from destruction. At first glance the fortunate and unfortunate ways in which the money comes in and goes out of the Younger household add absurdity to a play where circumstance and fate seems to overpower human autonomy. However, Hansberry complicates this assumption by making Walter's decision to choose dignity rather than submission the true means to salvation.