At will doesn't mean you can test out more employees. It means you don't have to pay anyone any pay when you let them go. It has side-effects. A worker will

At will doesn't mean you can test out more employees. It means you don't have to pay anyone any pay when you let them go. It has side-effects. A worker will bolt at the first better opportunity or when your company looks like they are in trouble because they have to. It also raises wages as people changes jobs more often.