The essay geekI have located this source https://www.zippia.com/morgan-stanley-careers-7713/ https://www.zippia.com/security-industry-spec

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industry and/or academic sources that would show the average employment length for stockbrokers in US and of stockbrokers at Morgan Stanley US specifically.  I have located this source https://www.zippia.com/morgan-stanley-careers-7713/ https://www.zippia.com/security-industry-specialists-careers-37922/ indicating a 4.3 avg length but I need official sources (governmental industry related e.g. FINRA SIMFA SEC or academic research papers or studies) that would back up this result or indicate a different value that I could quote.Thanks Violet Nov 18 2021