Disease, then, which is an obstacle to the happiness of mankind, becomes to him the source of his comforts.

The reasoning of all producers is, in what concerns themselves, the same.
As the doctor draws his profits from _disease_, so does the ship-owner from the obstacle called _distance_; the agriculturist from that named _hunger_; the cloth manufacturer from _cold_; the schoolmaster lives upon _ignorance_, the jeweler upon _vanity_, the lawyer upon _cupidity and breach of faith_.

Each profession has then an immediate interest in the continuation, even in the extension, of the particular obstacle to which its attention has been directed.
Theorists hence go on to found a system upon these individual interests, and say: Wants are riches: Labor is riches: The obstacle to well-being is well-being: To multiply obstacles is to give food to industry.
Then comes the statesman; and as the developing and propagating of obstacles is the developing and propagating of riches, what more natural than that he should bend his efforts to that point?
He says, for instance: If we prevent a large importation of iron, we create a difficulty in procuring it.

This obstacle severely felt, obliges individuals to pay, in order to relieve themselves from it.

A certain number of our citizens, giving themselves up to the combating of this obstacle, will thereby make their fortunes.