I read this article which reinforces the impact a manager can have on a retail store. If you are experiencing high than usual turnover rates then maybe you need to take a look at your approach (assuming of course you are the manager).
Walking around, carrying a big stick and beating people into submission does not foster a great work environment. If you're serious about improving your business focus on taking care of your staff. This will reduce turnover which usually leads to better customer service, and ultimately, an increase in sales.