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You do realise that your consumption of garbage bags does not double because you buy two rolls at a time. If you are wealthy enough to save up for a one-time investment of 1 roll of garbage bags, you are able to implement the scheme suggested by the original poster.

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Yes I realize that consumption does not double simply because you buy double. I am not commenting on garbage bags (the topic is detergent); I am commenting on the strategy being used for more than 1 thing. If you use this strategy for 1 item, okay, I get it, the expense is fine. But if the trick is used for other things (as seems logical) then the initial expense of starting to do this could be large.

You are arguing against yourself. You made up this idea that if you buy extra detergent (because you keep running out of it) you also need to buy more of everything else.

You're not making any sense here.

Nothing is forcing you to go buy double everything each time you shop.

If cash is tight but you want to implement this scheme, buy an extra unit of one household item (e.g. laundry detergent) your first trip. Hext time, choose another item (e.g. trash bags).

Eventually you've got a backup unit of every item, and you're now just buying your one item on the same consumption schedule, except now instead of replacing the item you're replacing the backup.

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