Carrots were very expensive and rare in 1939. Farmers hadn't figured out how to grow them in industrial quantities yet. Scarlett O'Hara cried because she knew that she only got access to carrots due to her role in the film, and she might never be able to afford to have one ever again.
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At the end of Gone With The Wind (1939), why does Scarlett O'Hara cry while eating the carrot? | Spyke
Carrots were very expensive and rare in 1939. Farmers hadn't figured out how to grow them in industrial quantities yet. Scarlett O'Hara cried because she knew that she only got access to carrots due to her role in the film, and she might never be able to afford to have one ever again.