But the negatives for workers in contingent situations can be problematic. This is especially true when the worker is scheduled, then canceled at the last minute. The effect can range from mildly annoying to financially catastrophic.
I have experienced this phenomenon myself, in jobs ranging from food server to night security dispatcher.
That was a long time ago, but in the interim years I have been disappointed to see more, not fewer employers using this staffing process.
Here's the thing to know about these contingent-work schemes: If you are the worker in question, you are essentially subsidizing your employer. You are giving the company the benefit of a skilled, trained labor pool on constant call, but with none of the expense of using a contract house or external temp pool for the same purpose.
In all fairness, shouldn't the workers in these situations share in some of the benefit? Yes, but it's up to you to make it happen. If you have the bargaining power of a union or other workers, or if you have a particularly amenable relationship with your boss, you may be able to negotiate something that favors you in exchange for giving up the security of definite pay and hours. For example, you could request a paid holiday or a partial fee for canceled shifts.
At the very least, you might be able to use your state's unemployment system to fill in the income gaps, although this isn't likely for very intermittent or part-time jobs.
If the job is temporary or just something on the side, you might just have to wait it out. But if it is your primary employer who doesn't schedule you consistently, you'll need to either seek new work or buffer the effects by developing a sideline that you can turn to on unexpected days off.
Some possible standbys include operating a part-time Internet businesses, making crafts for local outlets, or running your own on-call service where you email a short list of potential customers whenever you're suddenly available to hook up computers or baby-sit their kids.
Or, if none of this juggling appeals to you, just look for another job. But don't continue to subsidize your employer without recognizing what it's costing you, in terms of income and time you could have spent doing something else – like sleeping.