The per-capita mana supply is equal to the total amount of mana in the balances of all accounts on Manifold, plus loans that have not yet been paid out (i.e. the previous two quantities combined are equal to the amount of mana if everyone sold all their shares in every market), plus all market liquidity, plus any other conceptual repositories in which mana can exist such as bounties. This ignores any mana held by Manifold, such as the official @Manifold account, but includes mana held by the personal accounts of Manifold employees. Any accounts with a negative balance are treated as zero.

This refers specifically to the period from the first of a month to the first of the next month (or the last of the month, if that's easier to calculate); the per-capita mana supply must be lower on that date in the second month than in the first. (In other words, I'm not looking for any 1-month-long period in which this occurs, it has to specifically line up with a calendar month.)