If for every dollar you spend, you have to be aware of its history ("Oh, sorry, I can't buy cigarettes now, I only have two research-grant-dollars and three fro

If for every dollar you spend, you have to be aware of its history ("Oh, sorry, I can't buy cigarettes now, I only have two research-grant-dollars and three from my non-smoking mom, neither of which may be used for tobacco"), then the money ceases to be money (in the meaning of uniform tokens of value) and you're back at some later stage of bartering economy.