Is FIFO, SISO, TITO. . . . . or FILO, SISLO, TITLO. . .NINLO . .etc. actually advantageous? What is the possible benefit of matching the quantity of a Sell to a quantity that was bought in a particular order?
The primary use of matching individual buy lots with sale lots, and in which order FIFO or LIFO are mainly to due with recognition of gains or losses, particularly in a non-tax sheltered account. As AIM advocates buying at lower prices, if we match a later sale to the first lot, we may actually have a loss, but if we match it to the last we should likely have a gain. Outside of tax considerations, it shouldn't matter and your idea of a common pool makes perfect sense. If you live in a place where capital gains aren't taxed (tell me where it is, please!) this becomes a non-issue!
Best,
AIMster
