How is a business going to say "we desperately need employees, looking to hire at least 10 people by the end of the year." Then not schedule their employees to work?

Nothing in this world is free, and people need more then 10 hours a week of work. Wouldn't it make more sense to have 5 employees at 30 to 40 hours per week then to have 20 employees working 5 to 10 hours?

Maybe I'm wrong?

I am so ready to break free from the matrix..