W Rand: It is one of the oldest discussions in the economic domain, thinkers like Plato and Aristotle already having contributed to it. It reminds us that everything done in this world demands effort and, therefore, has a cost.

It is one of the oldest discussions in the economic domain, thinkers like Plato and Aristotle already having contributed to it. It reminds us that everything done in this world demands effort and, therefore, has a cost.