This is more about relative decline of reading level. Only 13% of adults read at PIAAC levels 4 or 5, so it's not like college degree means that you have maxed

This is more about relative decline of reading level. Only 13% of adults read at PIAAC levels 4 or 5, so it's not like college degree means that you have maxed out at reading skills. When high reading levels decline, other levels decline as well.