Title text:
“You legs may have a comparative advantage at running, but we arms have a competitive advantage at swinging hammers, so unless you accept that we’re the dominant limbs and stop hogging the oxygen, that running advantage won’t be around for long.”
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3290/


I have a trade deficit with the grocery store. I buy apples and they don’t buy anything from me in return.
Precisely. If anything, the country in deficit is closest to the leg in this analogy.
You’re getting scammed. You should tariff the grocery store. Demand that the total on the bill increase by 50% and that that increase be paid back to you. That should teach 'em.