My advisor was against a theory section for my first paper when I proposed it. "why" Caveat emptor, am not smarthttps://twitter.com/Noahpinion/status/863454979570323456 …
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Question of "What should be the unit contribution of a single paper?" is interesting generally (and answers can be upsetting)
Yes--usually discuss implicit models in an introduction, but no need to build a bespoke system to justify estimating eg one point elasticity
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