Well, pedantically, employees is an aggregate term, and higher salary costs (either by higher individual wages or more individual wages) meets the conditions.
Less pedantically: the focus was on more, better trained employees, and more experienced employees. In the later two situations, this generally translates to individuals being better paid -- experienced workers demand higher wages, as to better trained ones. Further, a large number of the faiure examples given were about firing the higher cost employees (experienced, trained ones, and full-time ones) in favor of cheaper ones, again implying that the per-employee wages were dropped as well.
Less pedantically: the focus was on more, better trained employees, and more experienced employees. In the later two situations, this generally translates to individuals being better paid -- experienced workers demand higher wages, as to better trained ones. Further, a large number of the faiure examples given were about firing the higher cost employees (experienced, trained ones, and full-time ones) in favor of cheaper ones, again implying that the per-employee wages were dropped as well.