Not based on scientific evidence
Link to November 15 Boston Globe article, "Some liquid assets do well in downturns".
Excerpt: Bartending may be the ultimate recession-proof career: employment is expected to increase 13 percent between 2006 to 2016. [Wish we could say the same about librarianship.] “People aren’t going to stop drinking when things go bad,’’ says Toste. “In fact, they go out and drink more.’’
I don't know about you, but Toste's comment has a familiar ring to it.
Retiring Guy paraphrases, "People aren't going to stop reading when things go bad. In fact, they go to their public library more."