The Boston Red Sox had a little team turnover after they won the 1918 World Series, four games to two. Among the players they unloaded was George Herman Ruth, who ended up on the Yankee roster in 1920. The Red Sox didn't win another pennant until 1946. The Yankees were in the Series six times in eight years with Ruth on their side.

Don't tell a Red Sox fan turnover doesn't matter. And don't tell the folks at PayScale Human Capital that, either. They just put out a tome dispelling myths about turnover. And they make a compelling case that the impact of turnover is much trickier to measure than one might think.

Folks who follow the news are used to stories about mass firings and mass exoduses. We're taught to think that it's bad to binge on anything, so turnover in pretty much any form is considered a negative. But PayScale encourages us to reconsider labeling any sort of turnover, be it slow and low, high and hasty or anywhere in between.