The cars in the novel are examples of literary symbols because they represent the characters who drive them and Fitzgerald's overall opinion of the rich in 1920s society. They symbolize the materialism and selfish behavior of 1920s America.
The green light represents Gatsby's hopes and dreams for the future. Gatsby associates it with Daisy, and in Chapter 1 he reaches toward it in the darkness as a guiding light to lead him to his goal.
The point of parties in The Great Gatsby is to symbolize the moral degradation and shallowness of the people of the 1920s. Through the alcohol and extravagance, Fitzgerald is attempting to represent the pleasure seeking, immoral carelessness that the wealthy posses in his time period.
The eyes of Doctor T. J. Eckleburg are a pair of fading, bespectacled eyes painted on an old advertising billboard over the valley of ashes. They may represent God staring down upon and judging American society as a moral wasteland.
Tom and Daisy were highly educated and came from money, they get to lavishly live in east egg. It is not that they are wealthier than Gatsby, it is just because of how they got their money, and the people that they know that allows them to live in east egg.
New money: Gatsby got his money from selling illegal alcohol and throwing extravagant parties with the alcohol. He is forced to look across the water from his house in west egg and Envy Tom and Daisy Bucchanan