In the great gatsby does wealth alone decide which class a character belong

Yes the wealth does do that

I believe so because Gatsby was a wealthy man who was poor at first and worked his way to become rich (aka at the top) and the woman he loved was also rich and had a high class. The poorer people were lower class in the book/movie as well

harry says he would trade a gold mine for a glass of water.

i will say by providing an example of nationalism to explain the idea..

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