itsmek

Here's where you can go direct from Barcelona with a carry on for $100 max: https://www.google.com/travel/explore?tfs=CBwQAxoQKABqDAgDEg...

And the same for San Francisco: https://www.google.com/travel/explore?tfs=CBwQAxoQKABqDAgDEg...

Based on these I think airfare in the US looks better, especially considering the longer distances. Barcelona-London is the same price as San Francisco-Denver but 75% as far for example.

This sounds plausible to me. Can you please link to some of these studies you mention?

I feel like you're missing their point. The person you're replying to made a convincing argument that differentiates Person A and Person B by considering the fraction of products sold and how that affects the probability of the null hypothesis (using that price by chance). That's not a double standard.