Final answer:
Milkman Motors needing more supervisors due to a large sale order is an example of business expansion, which necessitates hiring more staff to meet increased demand and maintain quality.
Step-by-step explanation:
Milkman Motors receiving a large sale order and requiring more supervisors is an example of business expansion. When a company sees increased demand for its products, it typically needs to scale up its operations to meet the market requirements. This often includes hiring more staff, particularly supervisors and managers, to ensure that the quality of output is maintained and operations are efficiently controlled. Market forces, like the rise in sales, can lead to businesses taking actions to expand their workforce and sometimes to reconsider their hiring practices to include a more diverse range of employees as evidenced in situations like an assembly line only hiring men but needing more qualified workers, or a local flower delivery business noticing the demographic changes in the local residents.