Marshallian supply- demand synthesis of stable equilibrium

T H A T with Marshall the price point o f view delimits the economic field, does not precisely
Commit him to the demand-And-supply approach in price analysis. He is, however, .a and-supply economist. This, to be sure, is not much to say. All economists are so, no matter what they may accept, or purport to accept, as the principle, or the problem, or the group of problems, defining the economic field. Always and everywhere with all economists, price is the point of equilibrium or adjustment OJi equilibration between demand and supply. It is, then, safe as far as it goes-but always in the sense of the commonplace or the obvious-to announce that price is determined by demand and supply. It is merely an oracular way of asserting an undisputed thing. Knowing not even so much as the question
One may always refer the solution to demand and supply. Never is the argument thereby advanced excepting, perhaps, in the sense of a formal indication of a desirable or necessary line of procedure. No. Influence that does not report itself in demand or in supply terms, or in both, is relevant to price determination. The demand- and-supply expression is merely a formula of the signboard sort pointing to the terms to which all economic analyses must finally get reduced. Difficulties appear only with the attempt to trace out the various influences that finally report themselves in demand and in supply terms-to render an account of these underlying and explanatory facts and processes.
Wherefore, according to Marshall, the first· step in economic reasoning is the following:
That demand and supply are like two blades of a scissors and none of them can do the cutting alone.
Professor Alfred Marshall in his book (principles of economic) said:
We presented that equilibrium price is settled where demand and supply is equal.