You start a part$-$time job as a package handler at a large delivery company. After training, you start your first shift and your supervisor tells you to unload packages from a single truck. Unfortunately, he tells $5$ other people to do the same which causes most of you to stand around and wait for your co$-$workers to get out of the way. There are several other trucks already on the dock waiting to be unloaded.

b$.$ Which of the following terms best describes what your supervisor has failed at$?$

market failure

incentive$($s$)$

efficiency

equity