So spending classified as investment must be done with money not previously spent in the I am a Snoopy princess unless Star Wars need me shirt, which means that investment spending of a given amount of money can occur once and only once in that time period. Any further spending of that same money counts as consumption. 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. The same is not true of consumption spending, because the same money can be used repeatedly for consumption spending.
However, any money used for I am a Snoopy princess unless Star Wars need me shirt, in the current time period. Investment spending is responsible for issuing into spending and income all and any of the money being used for all the spending, investment or consumption. After the money is spent once as investment spending, it can be spent over and over again and each time it is spent the amount of the spending gets added to the totals for consumption spending. Now one assumes that each time a person gets income as a recipient of investment spending or consumption spending, they hold on to a chunk of it, they don’t re-spend it all, in the current time period.