Willy tragically concludes that he is 'worth more dead than alive', having scrimped to keep up with insurance payments. His suicide illustrates the sad fact that he can still only equate worth with money and popularity: not the love of family.

As stated above, Willie commits suicide in a final effort to achieve some semblance of success. The money from the life insurance policy is unlikely to be paid out however because the policy does not cover death by suicide. 

In the play Willie is concerned that he has been a complete failure, which is true in some ways. He has not managed to achieve a great deal of professional success. However, he and his wife have paid off their house - an achievement which he ignores - and they have raised two healthy, relatively capable children. Willie does not recognize these feats as achievements, comparing his life to the quick and astonishing financial success of his brother. 

Suicide is Willie's final failure and also his final attempt at success, again demonstrating his miscomprehension of value. 

Willy kills himself by crashing his car. He does in order to allow his son Biff to cash in on his insurance policy, allowing him to begin his own business, which was Willy's ambition for him. Biff, however, never wanted to be a businessman, and it is actually Willy's other son Happy who used the money as Willy had hoped.

Explain the philosophy of Willy Loman.

Willy Loman is concerned with himself more than anything or anyone else. He is apparently a good provider until we meet him later in his life, and that seems to justify his bad behavior and unfaithfulness. Willy does not respect women, and he has taught his sons to be like him. He is a stereotypical salesman who will do whatever it takes to close the deal in every area of his life. When he gets caught he is unable to apologize or make amends, for that is something men do not do according to his world view. He is also unable to talk about what is happening to him (forgetfulness, diminishing sales, thoughts of suicide) because he thinks it will make him look weak. He is of the opinion that silence is strength, but he loses his family and eventually his life because of that silence. 

Explain the philosophy of Willy Loman.

Willy Loman seems to believe that financial success is the true measure of moral success. To be a good person, one has to make money. 

This value system may simply be a response to Loman's moral failures as a husband and father which serves to deflect his real guilt and transgressions onto a playing field over which he has little control.