I've gotta know: Why toilet paper???

Long periods of isolation and the media

Explanation:

Being in a house all day instead of at work or school means you can't use their facilities, and as such need to stick your own. However with around 500-600 sheets on 2 ply paper and 1000 on 1 ply, there is no need to purchase so much, as for the time being, we are only in quarantine for 3ish weeks and unless you plan on defecating several times a day, you will be fine with just 2 or 3 rolls for your family. (all dependent on how much TP is used, and how big the family is)

the first question's answer is a.

fertile good for trade etc