The "Dormant" Commerce Clause 1-2-3

Some concepts are inherently irreducible.  The "Dormant" Commerce Clause, as the implied converse of the Commerce Clause, is one of those concepts.  The skeletal elements of are simple enough, however the application of those elements to the myriad variations of fact, purpose, and effects to arrive at a constitutionally consistent result is an art best handled by the sharpest of legal minds.  The following translation is presented for your consideration as both a challenge to identify any logical errors, and a welcome invitation to compare perspectives.