Difference between fixed and open-ended duration of social security

The term between the two is different. The difference between fixed-term and open-ended social security is that one is a contract with an expiration date and the other is a long-term contract, so the difference between fixed-term and open-ended social security is that the duration between the two is different. Individual social security refers to what we usually call to participate in social insurance in the name of the individual, according to the words of the document, it should be "self-employed workers, freelancers to participate in social insurance".