in economics when you choose to spend money on something then the cost of the choice you didn't select is called the opportunity cost .
what is the terminology used to describe the situation of when you buy something now (and usually in bulk) at a low cost as in the future you will need to buy it anyway but it will be expensive.
Example -
woolworths online - 15 8packs Kleenex Cottonelle for $40.10 delivered.
usually $6.68.
currently halfprice so $3.34
if you buy 15 at this price you can get $10 off
so $2.67 per 8 pack.
so a saving of $4.01 per 8 pack.
or $60.15 in total for 15 8 packs.
I could say savings of $60.15 but I require the terminology which infers the savings/offset of future cost.
not like opportunity cost.
bulk buy?
ACA on the "bulk buy queen"
EDIT: Above is the first question. Second question, perhaps future savings?