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The issue with this approach, as outlined by Baumol, is that only one point on a demand curve can ever be observed at a specific time. Demand curves exist for a certain period of time and within a certain location, and so, rather than charting a single demand curve, this method charts a series of positions within a series of demand curves. [5]
A change in demand is indicated by a shift in the demand curve. Quantity demanded, on the other hand refers to a specific point on the demand curve which corresponds to a specific price. A change in quantity demanded therefore refers to a movement along the existing demand curve. However, there are some exceptions to the law of demand.
Price discrimination may improve consumer surplus. When a firm price discriminates, it will sell up to the point where marginal cost meets the demand curve. Some conditions are required for price discrimination to exist: Firms must face a downward-sloping demand curve, i.e. the demand for a product is inversely proportional to its price.
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]
The demand curve facing a particular firm is called the residual demand curve. The residual demand curve is the market demand that is not met by other firms in the industry at a given price. The residual demand curve is the market demand curve D(p), minus the supply of other organizations, So(p): Dr(p) = D(p) - So(p) [14]
The outcome is that, in the long run, the firm will make only normal profit (zero economic profit). Its horizontal demand curve will touch its average total cost curve at its lowest point. (See cost curve.) In a perfectly competitive market, the demand curve facing a firm is perfectly elastic.
Markets that face a downward sloping demand curve are said to have market power. This terms means that the markets have a certain power to decide their own price. [3] This does not mean that the firm can decide the quantity they wish to sell. The firm can decide the price and the quantity is determined by the demand curve.
"Kinked" demand curves and traditional demand curves are similar in that they are both downward-sloping. They are distinguished by a hypothesized concave bend with a discontinuity at the bend - the "kink." Therefore, the first derivative point is undefined and leads to a jump discontinuity in the marginal revenue curve.