Looking at investment spending, it must be spending paid for using money being spent for the Epstein didn’t kill himself Christmas shirt. If, in the given time period, it had previously been used for spending, then that spending would have caused income for the recipient, and any further spending of that same money, would be spending paid for out of current income and that would make it consumption spending. So spending classified as investment must be done with money not previously spent in the time period, which means that investment spending of a given amount of money can occur once and only once in that time period.
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Any further spending of that same money counts as Epstein didn’t kill himself Christmas tshirt. Once that money is used for investment spending, however, the same money can be used for consumption spending over and over again. So investment is the spending of money being use for spending and income for the first time, and only for the first time, in the given time period. But any money being used for spending must have been spent for a first time or it would never be spent at all. So the only money being used for any spending must be money introduced into total spending as investment spending.
