Answer: decrease, be unaffected.
Step-by-step explanation:
We should note that the output in the short run can be expected to reduce in the short run. This is due to the increase in the cost of employing an employee as there's at least a fixed input in the short run.
Subsequently, since the output is variable in the long run and not fixed like that of the short run, the output won't be unaffected in the long run.