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>undergraduate degree in economics and a bachelor's degree in physics.

I'm in the UK my understanding is a bachelor's is a synonym for an undergraduate degree; so why did you use the different terms here?

Ah, I think I see it: you copied from Wikipedia; wherein it says he did a bachelors degree in Economics (BA?) and a further bachelors in physics (BS/BSc) whilst he was a graduate. Two undergraduate degrees.

Other sources suggest he did the degrees coterminously:

>"Musk graduated from UPenn in 1994, with double bachelor degrees in Physics (from the College of Arts and Sciences) and Economics (from the Wharton School)." (http://studyadvantage.co/elon-musk-education-study/)

That sources says he had 2 days in a PhD program.

https://www.wharton.upenn.edu/academic-programs/ suggests he did what they call a "dual degree". Making Wikipedia wrong, he didn't "stay" for his second degree he did the two together.