Displacement:

“Weekend Warriors,” e.g. hobbyist musicians who don’t derive an income from performing tend to forget two important things. First, see service below. Second, whether or not they need money from performance, others do, and by performing, e.g. providing services for low or no wages, they not only devalue themselves and every other musician in that market, they also displace performers that would have gained work at that venue on that evening. See also “Same bathtub.”