"And today? Does the competitive market mechanism still operate? This is not a question to which it is possible to give a simple answer. The nature of the market has changed vastly since the eighteenth century. We no longer live in a world of atomistic competition in which no man can afford to swim against the current. Today’s market mechanism is characterized by the huge size of its participants: giant corporations and strong labor unions obviously do not behave as if they were individual proprietors and workers. Their very bulk enables them to stand out against the pressures of competition, to disregard price signals, and to consider what their self-interest shall be in the long run rather than in the immediate press of each day’s buying and selling. That these factors have weakened the guiding function of the market mechanism is apparent. But for all the attributes of modern-day economic society, the great forces of self-interest and competition, however watered down or hedged about, still provide basic rules of behavior that no participant in a market system can afford to disregard entirely. Although the world in which we live is not that of Adam Smith, the laws of the market can still be discerned if we study its operations."