explain how a local fast food restaurant manager faces almost perfect competition in demand for high-school employee labor

A local fast food restaurant manager is usually facing an almost perfect competition in demand for high-school employee labor. That of course goes mostly to the benefit of the restaurant, and in lesser measure to the high-school students as well.

The reason for this kind of situation is that the fast food restaurants do not seek any specific working skills or experience. It is also the easiest and most available job that the high-school students can get. The high-school students do not have high demands for their wages, as they use it as a job from which they can collect some spear money, usually for when they go to college. The manager faces a situation where there's labor force in abundance, much more than it is needed, with low demands for wage, and the work will be adequately done.