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The equilibrium price is at the intersection of the supply and demand curves. A poor harvest in period 1 means supply falls to Q 1, so that prices rise to P 1. If producers plan their period 2 production under the expectation that this high price will continue, then the period 2 supply will be higher, at Q 2.
This will tend to put downward pressure on the price to make it return to equilibrium. Likewise where the price is below the equilibrium point (also known as the "sweet spot" [3]) there is a shortage in supply leading to an increase in prices back to equilibrium. Not all equilibria are "stable" in the sense of equilibrium property P3.
However, "generically", an economy has only finitely many equilibrium price vectors. Here, "generically" means "on all points, except a closed set of Lebesgue measure zero", as in Sard's theorem. [24] [25] There are many such genericity theorems. One example is the following: [26] [27]
A market-clearing price is the price of a good or service at which the quantity supplied equals the quantity demanded, also called the equilibrium price. [2] The theory claims that markets tend to move toward this price. Supply is fixed for a one-time sale of goods, so the market-clearing price is simply the maximum price at which all items can ...
A situation in which the quantity of a good or service supplied is more than the quantity demanded, [169] and the price is above the equilibrium level determined by supply and demand; that is, the quantity of the product that producers wish to sell exceeds the quantity that potential buyers are willing to buy at the prevailing price.
On the other hand, any price below 10 is not an equilibrium price because there is an excess demand (both Alice and Bob want the car at that price), and any price above 20 is not an equilibrium price because there is an excess supply (neither Alice nor Bob want the car at that price). This example is a special case of a double auction.
These inherited properties are not sufficient to guarantee that the excess demand curve is downward-sloping, as is usually assumed. The uniqueness of the equilibrium point is also not guaranteed. There may be more than one price vector at which the excess demand function is zero, which is the standard definition of equilibrium in this context. [14]
In equilibrium these prices must equal the respective marginal costs and ; remember that marginal cost equals factor 'price' divided by factor marginal productivity (because increasing the production of good by one very small unit through an increase of the employment of factor requires increasing the factor employment by and thus increasing ...