Carvana (CVNA) shares surge after the online used car retailer reported its first profitable year in its fourth-quarter results. Yahoo Finance Live examines Carvana's stock movement Friday morning, outlining the challenges the company has seen and its gross profit per unit (GPU) figures. For more expert insight and the latest market action, click here to watch this full episode of Yahoo Finance Live. Editor's note: This article was written by Luke Carberry Mogan.

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