There is no such a priori simplicity as the quantity theory deals with.
For the quantity theory, dodo-bones, or anything else will do.
But the equation of exchange, as we have seen, does not prove the quantity theory.
But this is not to assert the doctrine of the quantity theory.
It is a part of the quantity theory that this is unnecessary.
For the quantity theory, the fall will be in proportion to the increase.
The quantity theory conflicts with the capitalization theory.
Certainly in its origin, the quantity theory is much the older theory.
But it is not clear that Ricardo added anything to the quantity theory.
The quantity theory is to be treated in detail at a later point of our study.