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Demand curves can be used either for the price-quantity relationship for an individual consumer (an individual demand curve), or for all consumers in a particular market (a market demand curve). It is generally assumed that demand curves slope down, as shown in the adjacent image.
The demand curve, shown in blue, is sloping downwards from left to right because price and quantity demanded are inversely related. This relationship is contingent on certain conditions remaining constant. The supply curve, shown in orange, intersects with the demand curve at price (Pe) = 80 and quantity (Qe)= 120.
According to the law of demand, the demand curve is always downward-sloping, meaning that as the price decreases, consumers will buy more of the good. Mathematically, a demand curve is represented by a demand function, giving the quantity demanded as a function of its price and as many other variables as desired to better explain quantity demanded.
For a PC company, this equilibrium condition occurs where the perfectly elastic demand curve equals minimum average cost. An MC company's demand curve is not flat but is downward-sloping. Thus, the demand curve will be tangential to the long-run average cost curve at a point to the left of its minimum. The result is excess capacity. [22]
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.
A Giffen good is a product that is in greater demand when the price increases, which are also special cases of inferior goods. [5] In the extreme case of income inferiority, the size of income effect overpowers the size of the substitution effect, leading to a positive overall change in demand responding to an increase in the price.
The AD (aggregate demand) curve in the static AD–AS model is downward sloping, reflecting a negative correlation between output and the price level on the demand side. It shows the combinations of the price level and level of the output at which the goods and assets markets are simultaneously in equilibrium.
The utility hypothesis tells us nothing about market demand unless it is augmented by additional requirements. [19] In other words, it cannot be assumed that the demand curve for a single market, let alone an entire economy, must be smoothly downward-sloping simply because the demand curves of individual consumers are downward-sloping.