Guarantees of and Correlates of GDP Per Capita

About a year ago, I made an Excel file with information on how countries’ capitals’ distance from the equator related with those countries’ GDP per capita (PPP) as of 2012:
loggdpvequatordistance
This may have errors, but I don’t know of any. As you can see, the Equator contains countries both rich and poor. However, the further North you go, the fewer poor countries one finds. By the time one has gotten to Iceland (the northernmost country in this chart), no poor countries are left. Why is this so?

Author: pithom

An atheist with an interest in the history of the ancient Near East. Author of the Against Jebel al-Lawz Wordpress blog.

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