Whatever vegetables or fruits were needed, it was Zheng Long who went to the market to survey, and then notified the driver to go to the suburban counties to find them.
They would first contact the local agricultural department and learn about the specific crops planted in the counties and villages below, then compare prices, and finally haul back the designated vegetables. Because the retail prices here were quite high, the wholesale prices were definitely relatively low. Given that the folks of that era were quite simple and, coupled with the monthly income of one hundred yuan he provided them with along with extra rewards for additional trips, making an easy one hundred fifty yuan a month, the likelihood of them betraying him was very slim.
After all, with the retail price set there, how much could they possibly embezzle?
As for whose service to use and whose not to use, that was up to them to decide; so, truck drivers of that era were quite esteemed.