Demand for a good or service is what's going to drive employment. Why would I keep a worker around, even at zero cost, if I didn't need them to be employed? W

Demand for a good or service is what's going to drive employment. Why would I keep a worker around, even at zero cost, if I didn't need them to be employed? When those 100 truckers are put out of work, how is cheaper employment going to make them useful to another business owner?