The sales-force is as truly a part of the labor-force of a corporation as are the mechanics.
In his labor-force he has his competence, and, if he makes no use of it, that is his fault.
If, as we have seen, labor has no value this is by no means the case with labor-force.
The owner of money pays out a day's value of labor-force but there belongs to him its use for the day, the whole day's labor.
It would have to direct the plan of production in accordance with the means of production to which labor-force also belongs.