Throughout the book it is clear that Gatsny represents people who have worked for their own wealth, while Tom represents those who have inherited their wealth. When these to characters are viewed like this, it seems that when they are both trying to be with Daisy they are really these two types of people competing in America. The Great Gatsby is a commentary on the wealthy in the 1920's. The message that it is really trying to send is that while most Americans say the opposite, American society actually sides with those who inherit their wealth. I think that Gatsby's death shows that those who worked for their own wealth eventually lose what they worked for to those who inherited their wealth.
Finally, Daisy is left with Tom and Gatsby's dream was gone. This shows that people who inherit their money do hold more power in Ameican society. In the end, this book seems to suggest that american society at least tries to favor people like Gatsby over people like Tom, when Nick says that Gatsby's worth all of them put together.