Should you do a PhD if money is your main goal?

Graduate School
4

<p>MD, residency in internal medicine, fellowship in cardiology: 4+3+2, 9 years. Average salary: $300K.</p>

<p>PhD in STEM, post-doc, tenure: 5+3+5, 13 years. Average salary: $99K. </p>

<p>The math is pretty clear to me.</p>