If you want to think of it this way, the value of the sandwich is “added” to you as a person.
If you engage in economic/productive activity, that consumed sandwich is the fuel that generates positive economic value.
Think of it as purchasing a tank of gas/petrol for a vehicle. If that fuel is used unproductively, that society’s total welfare has reduced but if it is used to generate even more value, then society’s total welfare has increased.
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