Interesting observation, Pondering. Social mobility versus economic wellbeing. I believe that the latter is a more noble and egalitarian goal. Social mobility is what many of our worst policies - domestic and international - are based on. It's a vapid promise that zeroes in on the individual as opposed to the collective. Someone will always be at the bottom of the economic pyramid of capitalism (and other similar greath wealth for the top tier economies). Social mobility has an implied "it's up to you to make it work - here are the opportunities". Economic wellbeing is making sure everyone has decent homes and food security, healthcare, education, opportunities to pursue goals, family supports to achieve goals, etc. It also values a level playing field over individual initiative.
I think it's the opposite. Economic well=being means how wealthy the country is as a whole even if all the wealth is at the top.
If a country has low social mobility it means everyone is stuck where they are. If you are poor you will stay poor. If a country has high social mobility, assuming it is upwards, it means people are advancing. Not potential for social mobility, actual social mobility.
"Economic freedom" is a meaningless measure. Maximum economic freedom means no taxes, no financial or other regulations, no worker protection laws, nothing that interferes with economic freedom. You have money, you can do whatever you want with it.
No economic freedom would be communism. The government owns everything.
The way the scale is designed implies that right wing libertarian = most free.
The framing places left wing economics as limiting freedoms whereas social mobility implies freedom to me.