[Swenrekcah]

The article uses the term. If there is a star in the sky and I see it, I don’t consume it so that you can see it too.

But if I occupy a spot, I “consume” that so you can’t be there simultaneously.

So there is rivalry if we both want to be there.

[chrisseaton]

Yes but 'in non-rivalrous' doesn't make any sense.

[whoisburbansky]

It took coming down to your comment to realize that GP had “in non-rivalrous,” I’d just glossed it over and assumed it said “is”