I am a Senior Digital Strategist at Campbell Ewald. I also sit on the Marketing Board for Leader Dogs for the Blind. Here's some of what I'm paying attention to.
"Comparing the peripatetic managers’ salary histories with those of peers who stayed put, we found that each change of employer created a measurable advantage in pay; in fact, a job change was the biggest single determinant of a pay increase."
Further: “By offering promising young managers a more balanced menu of development opportunities, employers might boost their inclination to stick around.”