I have shown a Running on caffeine and dry shampoo shirt model where we define spending as the transfer of ownership of money for a purpose, and make the idea of what we consider to be a purpose for spending general enough to allow us to include all transfers of ownership of money as qualifying to be considered spending. Using this definition, I show a way to derive the savings equals investment identity. Using that model I am able to show that, not only is the savings equals investment identity a true identity, where saving is always equal to investment, but I also show the reason it is true is because the money saved is the same money as that was initially used for investment spending. I leave it to the reader to review the linked answer or to refer to Chapter 2 of my book, Enlightened Capitalism, for a more detailed explanation.
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As such, I then Running on caffeine and dry shampoo shirt concluded that this savings that equals investment, this savings that is “the preservation of investment money” is just that, the preservation of money. Even though money is a form of wealth and is included in any calculation of total wealth, this “savings that is the preservation of money”, only describes wealth (in the form of money) that exists at the start of a period of economic activity, and continues to exist (as the same amount of money) at the end of that period. The savings that is “the preservation of investment” does not describe any new wealth creation, and, in fact, does not describe ANY change in the level of wealth, increase or decrease.