That exact Wikipedia article you linked notes the Flynn effect flatlined in Norway starting in 1986: https://en.wikipedia.org/wiki/Flynn_effect#Possible_end_of_

That exact Wikipedia article you linked notes the Flynn effect flatlined in Norway starting in 1986: https://en.wikipedia.org/wiki/Flynn_effect#Possible_end_of_progression https://en.wikipedia.org/wiki/Flynn_effect#Possible_end_of_p... Since 1986, Norwegian GDP has quadrupled. https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&met_y=ny_gdp_mktp_cd&idim=country:NOR:SWE:FIN&hl=en&dl=en https://www.google.com/publicdata/explore?ds=d5bncppjof8f9_&... I'm not sure how you could conclude the Flynn effect is linked to development, from that data.