> Each incremental physical good deprives someone else of a copy of that good which could otherwise be gained. This is not true for digital goods, which have ze

> Each incremental physical good deprives someone else of a copy of that good which could otherwise be gained. This is not true for digital goods, which have zero marginal cost. No tangible good has a zero marginal cost. While true, that's irrelevant to an argument that claimed that sunk costs were an externality that wasn't all that important.