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bigstrat2003
8 days ago
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Postal Arbitrage
Only if you weren't already paying for Prime. If you were, then it's irrelevant as this usage adds no marginal cost.
moralestapia
8 days ago
[–]
"If you already pay for shipping then shipping adds no marginal cost."
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OkayPhysicist
8 days ago
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well, yeah. That's what the phrase "marginal cost" means: if it costs $x to do something N times, and $x + $y to do something N+1 times, $y is the marginal cost.
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