how was Willy Loman a tragic figure in the play?
First of all, make sure you are clear on what a tragic figure is:
http://www.answers.com/tragic
Then be sure to read the character analyses at these sites:
http://www.sparknotes.com/lit
and
http://www.gradesaver.com/classicnotes/titles
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go to pinkmonkey and you will find characther of Willy that is an excellent website!