The social peculiarity which explains the emphasis put upon profit as an inducement to productive serviceable work stands out in high relief in the identification of work with labor. For labor means in economic theory something painful, something so onerously disagreeable or "costly" that every individual avoids it if he can, and engages in it only because of the promise of an overbalancing gain. Thus the question we are invited to consider is what the social condition is which makes productive work uninteresting and toilsome. Why is the psychology of the industrialist so different from that of inventor, explorer, artist, sportsman, scientific investigator, physician, teacher? For the latter we do not assert that activity is such a burdensome sacrifice that it is engaged in only because men are bribed to act by hope of reward or are coerced by fear of loss. The social conditions under which "labor" is undertaken have become so uncongenial to human nature that it is not undertaken because of intrinsic meaning. It is carried on under conditions which render it immediately irksome. The alleged need of an incentive to stir men out of quiescent inertness is the need of an incentive powerful enough to overcome contrary stimuli which proceed from the social conditions. Circumstances of productive service now shear away direct satisfaction from those engaging in it. A real and important fact is thus contained in current economic psychology, but it is a fact about existing industrial conditions and not a fact about native, original activity.