In Poland we had the Argentinian system implemented, the one that gives private companies free hand with your mandatory savings and caused failure of retirement system and fall of government in Argentina. In 10 years i lost about 30% of what i paid into it because stockmarket play failures and very high fees taken by those that played. Basically everyone else also lost which forced a liberal government to give people option out of it into huge state company buying bonds, which is also shit but at least you won't lose everything because state institution won't just (hopefully) run away with your money.

And btw all this didn't caused any social unrest in Poland and the improvement, literally the only good thing libs ever did, caused massive outrage.