The essay geekHello I need help locating governmental industry and/or academic sources that would show the average employment length for

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I need help locating governmental industry and/or academic sources that would show the average employment length for stockbrokers in US and of stockbrokers at Merrill Lynch US specifically. Hello I need help locating governmental industry and/or academic sources that would show the average employment length for stockbrokers in US and of stockbrokers at Merrill Lynch US specifically.