Why does social security lapse after 7 years of non-payment

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Social security does not exist in the lapse of this statement, your previous purchase of social security in Shenzhen, and Taishan's social security can not be cumulative, at present can not be transferred across the city, you can only choose this way, to find a unit to continue to pay in Shenzhen, has been paid to fifteen years until the time if you work in Taishan for a long time, you will be stopped in Shenzhen, or retired, in any case, a person can not purchase two social security.