"So difficult it is to show the various meanings & imperfections of words when we have nothing else but words to do it with" John Locke
Scandinavian welfare states may have also leveled the educational attainment between citizens of different classes. Quality education reaches everybody. This could explain the U.S.'s continued gains, as students in poorer areas continue to play catch up with their upper-class peers.
Societies escalated skill requirements in the 20th century. That environment caused IQs to rise. Conversely, Flynn and Shayer note, if 21st-century societies lessen skill requirements, IQ scores will backpedal.
But the question of whether our IQ scores are higher than another society's, whether historical or contemporary, isn't what truly matters. It's whether we've developed societies that support and foster our many different intelligences wisely and purposefully. As Flynn and Shayer point out: "Capitalizing on a people's intelligence, rather than worrying about their intelligence, is the most important thing."
© Kevin Dickinson