Carvana 'Can Grow Aggressively,' Newcomer Amazon Auto Limited To Just One Brand: Analyst

1. Carvana shares rise as analysts upgrade ratings from Neutral to Overweight. 2. Amazon prepares to enter the used-cars market, benefiting online auto sales. 3. Amazon's entry offers limited selections, minimizing direct competition for Carvana. 4. Analysts predict Carvana's retail unit sales could rise significantly by 2024. 5. Recent analyst remarks indicate overall strength in the online auto sector.