A common restatement of Say's Law says that it "creates" another concept.
Hotelling's lemma shows this quantity is equal to the derivative of another function. A similarly named concept will not change with the price level in the long run, but may be horizontal or upward sloping on an AD-AS diagram in the short run. When externalities exist, this quantity is not equal to total social cost. For a competitive firm, this quantity is found by locating where marginal cost equals price. A common restatement of Say's Law says that it "creates" another concept. In a graph of price versus quantity, this quantity is almost always upward sloping. For 10 points, name this economic quantity, which at market equilibrium will be equal to demand.
Hotelling's lemma shows this quantity is equal to the derivative of another function.
supply [or aggregate supply; or output]