What is the significance of Jordan's lies?
Jordan might be seen as the hard-hearted liberated young woman, as opposed to Daisy representing the more naive-appearing young woman in Fitzgerald's portrayal of the Lost Generation. Jordan plotted and lied and used people as she needed to accomplish her personal goals and pleasures.
She was incurably dishonest. She wasn't able to endure being at a disadvantage and, given this unwillingness, I suppose she had begun dealing in subterfuges when she was very young in order to keep that cool, insolent smile turned to the world...
In The Great Gatsby, Fitzgerald endeavored to highlight the lack of moral character and personal responsibility he saw in much of well-to-do American society of the 1920s. Jordan's lies, big and small, come easily and often; they help to support Fitzgerald's picture of immoral attitudes and lifestyles.