Comment by bigstrat2003
Comment by bigstrat2003 21 hours ago
Only if you weren't already paying for Prime. If you were, then it's irrelevant as this usage adds no marginal cost.
Comment by bigstrat2003 21 hours ago
Only if you weren't already paying for Prime. If you were, then it's irrelevant as this usage adds no marginal cost.
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.
"If you already pay for shipping then shipping adds no marginal cost."