I thought this was a very good article about the decision whether or not to pursue graduate study, and in particular, a Ph.D. There are a lot of people on this forum that seem to think they want one just for the credential or for various other reasons that probably aren’t so great, so I think this may benefit some folks who come browsing these forums.
http://www.sciencemag.org/careers/2017/08/should-you-go-grad-school