“We show that global progress in learning—a priority Sustainable Development Goa

–“We show that global progress in learning—a priority Sustainable Development Goal—has been limited, despite increasing enrolment in primary and secondary education. … average estimates mask considerable heterogeneity associated with income grouping across countries and regions. This heterogeneity highlights the importance of including countries at various stages of economic development when analysing the role of human capital in economic development.”–

IOW: you have to build the whole society from the baseline of the degree of neotenic evolution (roughly average IQ) through to the institutions and the economy.
This is another way of saying your economic social and political condition is more dependent upon your fellow citizens (and their genetics and religion) than on you yourself.