In the AI era, revenue-per-employee is the new Big Tech metric

Mort Zuckerman, middle, in 2007 with then-NYC Mayor Michael Bloomberg

Patrick McMullan via Getty Images

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Revenue-per-employee is back, and it's becoming one of the most telling metrics in tech.

Back in my Bloomberg News days, Mike Bloomberg obsessed over this number. The logic was straightforward: how much revenue does each employee generate?