“El precio real de cada cosa, lo que cada cosa realmente le cuesta al hombre que quiere adquirirla, es el esfuerzo y la molestia de adquirirla.”
Texto de la edición incorporada · inglés
“The real price of every thing, what every thing really costs to the man who wants to acquire it, is the toil and trouble of acquiring it.”
— Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations