I am not sure, but the only phrase that comes to mind is "X market" as in "janitor market", but I think it may sound odd in certain situation.
Here's an example that might help understand what I mean:
Because the young generation don't want to do labor-intensive work, there was a huge lack of labor in the janitor market, which drove the wage for janitorial work through the roof to the point they earned more than most white-collar workers.