I could see an argument for toilet paper. It depends on how quickly society collapses. A gradual collapse seems more likely. The beginning would look a lot like the recent shortages of supply and distribution we are seeing right now. Could be a year or more before the complete breakdown of law, order, and utilities. In the meantime a person would still be expected to go to work, pay property tax, and so on. During this period a person could trade commodities for goods and services without arousing suspicion and avoid depleting their own stocks. Look at the collapse of the ussr as an example. Razor blades, liquor, and condoms demanded a premium. In the event of a sudden disruption in the supply chain and people quickly starving none of it would be useful, but that may not be the only course of events.