The Economist tried to solve this in the past with https://www.economist.com/interactive/big-mac-index (https://en.wikipedia.org/wiki/Big_Mac_Index for non-subscribers)

▲

tracker1 an hour ago | parent [-]

I often toyed with the thought of a TP index... literally the spend on something you use to wipe crap off your rear and throw away.

▲

autoexec 36 minutes ago | parent [-]

Short of unrolling it all and weighing it by the pound the math involved in the cost of TP is complicated. That said, McDonald's use of discriminatory/surge pricing complicates the actual cost of a big mac too.

	▲	tracker1 17 minutes ago \| parent [-]
		Even by the pound would be hard... quality two-ply vs low-grade gas station TP... The price per unit is also difficult to compare... are you getting the costco packs that still have the larger per-sheet area or the new, smaller sheets. Not to mention, in general it might be a counter-intuitive index... If the spend per person on TP on average goes down, is that an uptake in bidets, lowered tp costs, or economic affects and people choosing cheaper options? That said, I still think it could be a "fun" index to track over time.