to whether there is free industrial competition or not], by one or other of two causes—cost of production and reciprocal demand. A change in normal price, therefore, is a change which is the consequence of an alteration in one or other of these conditions. So long as the determining condition—be it cost of production or reciprocal demand—remains constant, the normal price must be considered as remaining constant; but, the normal price remaining constant, the market price (which, as we have seen, depends on the opinion of dealers respecting the state of supply and demand in relation to the particular article) may undergo a change—may deviate, that is to say, either upward or downward from the normal level. Such changes of price, occurring while the permanent conditions of production remain unaffected, can only be temporary, calling into action, as they do, forces which at once tend to restore the normal state of things: they may therefore be properly described as ‘fluctuations of the market.’ ”218
§ 5. When profits vary from Employment to Employment, or are spread over unequal lengths of Time, they affect Values accordingly.
Value, however,