One chart helps explain why Elon Musk is axing Tesla's Model S and X

Tesla is giving the Model X the ax. Its sales have likely been in decline for a few years.

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• Elon Musk said Tesla's Model X and Model S — the company's highest-priced cars — are getting the ax.
• While Tesla doesn't specify how many were sold, earnings show demand has been falling for years.
• Musk was sentimental when announcing the high-end EVs would get an "honorable discharge."

Tesla is taking its Model S and Model X to pasture.