Because they are flawed and larger than life
Answer: Yes this is true because dialogue is anything that is being spoken. If a conversation or a play has people talking at it (in quotations in a story), then this is dialogue.
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It represents the moral and social decay that results from the uninhibited pursuit of wealth, as the rich indulge themselves with regard for nothing but their own pleasure. The valley of ashes also symbolizes the plight of the poor, like George Wilson, who live among the dirty ashes and lose their vitality as a result.