If W < MRP, as in Monoposony then labor is being under utilized from a social effiency standpoint . The yellow shaded area represents the surplus gained by the monopsonist, an area larger than under competitive hiring. The green area is labor's surplus under monoposony, smaller than with competitive hiring. The red shaded area is surplus that is lost to the economy, dead weight loss that results from allocatively inefficient use of labor.