Alfred Marshall

Slavery was regarded by Aristotle as an ordinance of nature, and so probably was it by the slaves themselves in olden time. ”

The price of every thing rises and falls from time to time and place to place; and with every such change the purchasing power of money changes so far as that thing goes. ”

In every age poets and social reformers have tried to stimulate the people of their own time to a nobler life by enchanting stories of the virtues of the heroes of old. ”

The hope that poverty and ignorance may gradually be extinguished, derives indeed much support from the steady progress of the working classes during the nineteenth century. ”