An economy is maybe the movement of resources in a defined society.
Doesn't have to be money, bartering would still be an economy. Scientists probably track social animals and how they interact and manage their resources, that'd be an economy.
All the various stats and measures are just ways of aggregating the activity to try and model and measure it in ways that are hopefully meaningful and have predictive power in order to make decisions.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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