If a firm faces a shortage of workers with very special skills, it may decide to undertake necessary training itself. if on the other hand it faces a shortage of unskilled workers, it may well off a small wage increase in order to obtain the extra labour. in the first case it is responding to an increase in demand for labor by attempting to shift the supply curve. in the second case it is merely allowing a movement allong the supply curve.
a. use a diagram to illustrate each case.
b. outline reasons why the marginal revenue product differs between workers in different jobs.