Some folks aren’t worth the bullet it takes to shoot them, and some folks ain’t worth arguing with. From Glen Filthie's blog
For what it is worth, when a prisoner is executed in Mainland China, the spent shell is meticulously picked up by a flunky and placed in a plastic bag. The bag and in invoice for the cost of the bullet is sent to the family of the now deceased prisoner. Failure to pay the cost of the bullet results in the loss of your job or you lose the privilege of living in the city.
Mainland China has mass executions when their jails become too full. They announce the event and haul the prisoners to a sports stadium. At that point, they execute fifty or a hundred prisoners by lining them up and shooing them in the back of the head. That frees up enough space in the jail for the next week's or month's haul of felons.