Social security from the big city to the small county is not a loss?

Social security from the big city to the small county is not a very loss Hello, the pro social security of the big city to the county, certainly not cost-effective! Because the accounting of retirement pay and the local social average wage is highly linked, and the annual adjustment of the retirement pay big cities to be higher than the provinces. The average social wage in big cities is much higher than the social wage in small places, because the social wage is each province, city accounting alone, but to retire in a big city is quite high conditions, at least in the big city to pay social security for more than 10 years, and a few years before the retirement of social security to be paid in the big city. It is not cost-effective, the big city to pay later to receive a high salary