U..S. employment statistics hit a new milestone last year, but not a positive one. In August 2021, almost 4.3 million workers quit their jobs, according to the U.S. Department of Labor. That's the highest number since the department began tracking voluntary resignations. Their reasons for leaving their jobs vary--the numbers track people who quit for a different position, as well as those who quit without having another job lined up. While the reasons for quitting vary, one thing is clear: Businesses are having a tough time getting employees to come back.