Willy is a salesman who has always been obsessed with success and material wealth. He believes that if he can just make enough money, he will finally be happy and secure. However, Willy’s pursuit of the American Dream is ultimately self-destructive.
He is unable to accept that he is not as successful as he wants to be, and he becomes increasingly bitter and disillusioned.
Willy's hamartia is his inability to come to terms with his own mediocrity and failures, which leads to his tragic downfall.