Meet the most powerful Goldman Sachs banker you've never heard of; Silicon Valley has made top data-

  Dear Readers, It was "millennial money week" here at BI, where we got the results back from an INSIDER and Morning Consult survey that polled 4,400 young Americans on their spending habits.  We published a number of stories based on the results. Here are some of the key findings.  If you're new to the Wall Street Insider newsletter, you can sign up here. Finances 1) Twenty-eight percent of millennials think they're worse off financially than they thought they'd be a...