International comparisons are difficult, because the numbers are rarely comparable. The US system is based on paying large amounts of money to people, who then use large amounts of money for paying for various services. The European system pays or subsidizes many of those services with tax money, while nominal wages and benefits are lower.
The US social security is not a pension system. It's a welfare system designed to pay for basic necessities for those with no other substantial income. Its nominal target is replacing 40% of income, though that decreases with income. Mid-income people already receive less than 40% of their former wages.
Mandatory pensions typically replace 60-80% of income. Their purpose is to support retirement without a substantial decrease in quality of life. The French system, as far as I understand, is rather generous, aiming to replace 70-80% of income.
The US social security is not a pension system. It's a welfare system designed to pay for basic necessities for those with no other substantial income. Its nominal target is replacing 40% of income, though that decreases with income. Mid-income people already receive less than 40% of their former wages.
Mandatory pensions typically replace 60-80% of income. Their purpose is to support retirement without a substantial decrease in quality of life. The French system, as far as I understand, is rather generous, aiming to replace 70-80% of income.