It is also just; because it is just that an effort crowned with success should bring its own reward.
But these effects, good and bad, although permanent in themselves, are not so as regards the producer.

If they had been so, a principle of progressive and consequently infinite inequality would have been introduced among men.

This good, and this evil, both therefore pass on, to become absorbed in the general destinies of humanity.
How does this come about?
I will try to make it understood by some examples.
Let us go back to the thirteenth century.

Men who gave themselves up to the business of copying, received for this service _a remuneration regulated by the general rate of the profits_.

Among them is found one, who seeks and finds the means of rapidly multiplying copies of the same work.