what aspect of the plot can be viewed as a deus ex machina?

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.