Personal Finance on a LIFO/FIFO Basis? How do you think of it?

This is probably a stupid question, but when you buy stuff, say, at a grocery store, do you think of your money as being spent on a LIFO basis? Like, let's say it's Christmas and you get $100 from your family, and then go buy a bottle of whiskey or a few cases of beer, do you consider it to be their money you spent, or how do you think of it?

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Jul 7, 2019