I heard an interesting story that Yahoo pays LinkedIn lots of money to figure out which of their employees are looking to leave in order to offer incentives to

I heard an interesting story that Yahoo pays LinkedIn lots of money to figure out which of their employees are looking to leave in order to offer incentives to get them to stay. Certainly, employers could do the opposite with that information and let you go, but that's about as simple of a way to get a raise as I could think of (assuming your the type of employee they want to keep around).