We pay more for wheat, because, to produce it Nature requires more labor from man.

It is evident that if Nature did for the latter what she does for the former, their prices would tend to the same level.

It is impossible that the producer of wheat should permanently gain more than the producer of potatoes.

The law of competition cannot allow it.
If by a happy miracle the fertility of all arable lands were to be increased, it would not be the agriculturist, but the consumer, who would profit by this phenomenon; for the result of it would be, abundance and cheapness.

There would be less labor incorporated into an acre of grain, and the agriculturist would be therefore obliged to exchange it for a less labor incorporated into some other article.