If I claim that a gas station has a monopoly within a three block radius, that might be technically true, but only because of the constraints I applied. It's not actually a meaningful distinction if the consumer can drive down a bit further and find another gas station.

Imo it's more like saying, "Foocorp in the US doesn't have a monopoly, since you can always move to Canada and buy from BarCo or one of its competitors there!" Well, Foocorp is still the only seller in the US, so they have a monopoly in that market.

Sure. I also have a monopoly in the market of "selling lemonade on my front lawn". Is that a meaningful distinction?

> Imo it's more like saying, "Foocorp in the US doesn't have a monopoly, since you can always move to Canada and buy from BarCo or one of its competitors there!" Well, Foocorp is still the only seller in the US, so they have a monopoly in that market.

No one would consider moving to another country a realistic alternative. So in that situation, yes, there is a monopoly because the consumer does not have a realistic alternative. If a gas station is the only gas station in the city, then it too would have a monopoly in that city, because driving to the next city every time you needed gas is not realistic.