What's with the toilet paper thing?! Explaining the psychology of coronavirus panic buying of TP

KNXAM: On-Demand
Tuesday, March 10th
You've been hearing the reports on this for the past two weeks and seeing the empty store shelves for yourself:  a run on hand sanitizer, soap, face masks, bottled water.........and toilet paper.

With coronavirus fears rampant, the first group of items makes sense.........but what's with the toilet paper?