Law of Walras
The law of Walras establishes a relation between the various markets of an economy and says to us that, in a gone economy with NR, if N-1 gone are in balance, then the Nth market is also in balance.
One of the consequences of this law is that if a market is not balanced, then there is at least another market which is not in balance. Let us note that this law calls into question one of the important postulates of the classical and neo-classic economics of then, namely that the currency is neutral in the economy, that it is only one intermediary of the exchanges, does not have an other role, and that basically, a cash economy is equivalent to a barter economy. Indeed, we deduce from the law of Walras that, if the market of the currency is in imbalance, then at least another market is also unbalanced: the currency thus has a direct influence on the economy (in addition to the influence which it has through interest rate or inflation).
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