How do couriers make money?

I often see mountains of express shipments delivered and received at one express delivery point after another. Can you still make money doing this in 2017?

Not long ago, I saw a transfer express delivery point somewhere. It is the simultaneous transfer of agency points of two companies. I had nothing to do in the past to pick up express packages, so I chatted about the normal birth. I don’t know how much the current agents cost. If the transfer fee for a truck from two brands is 130,000, is it expensive? In the past, I knew that the main source of money for express delivery points was to send out parcels. The parcels received from the company every day were sent out. These parcels were mainly able to maintain daily circulation. Judging from their appearance, there is a constant flow of pieces every day. What processes are required if they take over. What kind of system does the express delivery point operate? Does anyone know anything about this industry?