I believe that this Star Trek Energize coffee shirt concept becomes most clear when we realize that income and net production of wealth are indeed independent variables. It is using that model that we can understand how “spending” does not get subtracted off of wealth, because the two things are not accounted for on the same axis. And further, rather than being subtracted off wealth, at less than full employment, spending normally, on the average does lead to production of more wealth, not less wealth. Now I would caution that one not “get stuck” in that type of rigid thinking that implies that only certain types of production “count”. That is there are those who think that the only things that count as production is tangible wealth with easily appraised value. Cars, houses, electronic devices, fuel, etc.
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Keynes realized that the Star Trek Energize coffee shirt best type of spending is the type of spending that directly pays for activities that produce more wealth. But he also realized, that if such spending were not forthcoming, and we were at less than full employment, that any spending increase, via its multiplier effect will still lead to increased production. Keynes has been grossly misrepresented repeatedly by those who imply that he was in favor of spending that would decrease overall wealth production in an economy. This is completely false. At any rate, in microeconomics, when we are talking about an individual or a firm, spending is the depletion of the firm’s or individual’s wealth. In the macroeconomy, spending is just the transfer of ownership of money and does not represent a depletion of wealth.