A term getting around at the moment is "Acting your Wage" which I like a lot better. Employers shouldn't be surprised when people do what they're paid to do.
I'm assuming of course that you mean what I ususally have seen which is "i arbitrarily decide how much work to do". If you mean this is just "not go above and beyond", then sure.
Imagine if you were a contractor tasked with painting a room. Mid painting the expectation changes to "you're also expected to reinstall window and door trim, and paint it" (at no extra cost and by staying at jobsite longer), but with a remote probability of increased pay later. Or... The customer fires one of your colleagues and tells you that you and one more person must now deliver the job at the same pace.... but with only two thirds of the pay.
Uh,no. It's usually getting more and more work coz someone left/got fired and employer goes "well, productivity looks the same" (coz everyone is working that bit more) "why hire more?".
Or frankly you just learned more and are more productive than you were year ago... for same wage.
This is like an employer failing to gauge the number of people needed to do a job, just tell you to do a little extra...
Never ever will you get the benefit of a cut from the cost of the missing people, but your employer WILL get the benefit of delivering something more valuable to the market.