Final answer:
Higher job-switching costs lead to less responsive quit rates to wage changes, steeper labor supply curves for firms, and workers remaining in lower-paid jobs, but contrary to the options provided, they do not reduce a firm's monopsony power.
Step-by-step explanation:
The question pertains to the effects of higher costs associated with changing jobs in a labor market. When such costs increase, the following outcomes can be expected: quit rates will not be perfectly responsive to changes in wages, individual firms' labor supply curves will slope upward, and some workers will stay in jobs even where higher wages may be offered elsewhere due to the costs tied to switching jobs.
However, higher job-switching costs will not result in firms losing monopsony power. In fact, higher costs can consolidate a firm's control over the labor market as it becomes more difficult for workers to leave, even if offered higher wages elsewhere. This effect entrenches the monopsony status of a firm.