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...or the way people thought about these things before. It's super obvious to you and me that economic action happens marginally and at the individual level. But I'm not so sure the classical economists had that same impression
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I'm probably just overthinking it. The phrase "Much of the actual action in economics comes at the level of the aggregates" feels wrong to me. The action happens at the individual level, but it's fair to say that we care more about the aggregates, or we're better able to measure the aggregates.
I might just be getting too nuanced about the semantics.