That index is primarily not based on economic mobility. If you open up its wikipedia page the actual economic mobility related to income and resulting wage clas

That index is primarily not based on economic mobility. If you open up its wikipedia page the actual economic mobility related to income and resulting wage class is only one of the contributing factors. European policy choices such as socialized healthcare and a tax regime which constrains high-wealth business have an equalizing effect on many of the measurements indicated in the social mobility index. As such, I would not place excessive stock in this particular measure when it comes to actual economic mobility between social class.