Matilda's greatest failing was her chronic discontentment and unreasonable craving for luxury she could not afford. Born into a modest family, she "suffered incessantly, feeling herself born for all delicacies and luxuries," constantly torturing herself by comparing her simple life to imagined riches. This vanity drove her to borrow a diamond necklace to appear grand at the ball, and when she lost it, pride stopped her from confessing the truth to Mme Forestier. Had she been honest, she would have discovered the necklace was fake — worth only 500 francs — and spared her family ten years of grinding poverty.
Source: The Necklace, Chapter 7
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The examiner expects you to link Matilda's character flaw (discontentment/vanity) directly to the consequences shown in the story. Three key points earn the 3 marks: (1) her incessant longing for luxury, (2) her pride/vanity at the ball, and (3) the irony that honesty could have saved her. Always quote or paraphrase from the text to show evidence.