SEATTLE -- It can be hard to plan for basic needs, like paying rent or taking care of your kids, if you don't know when you'll be working next week or just how many hours you will be needed.
A new study by researchers at the University of California-Davis, finds that an unpredictable work week is the norm for growing numbers of low-wage workers -- nearly 40 percent of whom worked variable hours for at least one four-month period after the start of the 2007-09 Great Recession.