A year or two ago, I recall watching a YouTube video that looked at the GDP of various cities and argued that there was a weak positive correlation between their elevation and their GDP. I can't find the video again and I haven't been able to find many supporting documents for this - I did find one about China but not the world at large. https://link.springer.com/article/10.1007/s11629-017-4393-0
Has anyone seen this argument and know the details?