One of the persistent sources of economic misunderstanding is the difficulty of marginal thinking. It's frequently counterintuitive and leads to a false sense of injustice, e.g., "If teachers are so important, why are they paid so little?"

I’d go further and say “marginal net revenue” rather than the gross.

Using a revenue number for this makes no sense.

Let’s ignore for now that this revenue also owes a great deal to the commons that is never paid back by most companies.