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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 aggregate demand curve is plotted with real output on the horizontal axis and the price level on the vertical axis. While it is theorized to be downward sloping, the Sonnenschein–Mantel–Debreu results show that the slope of the curve cannot be mathematically derived from assumptions about individual rational behavior.
The AD–IA model is a Keynesian method used to explain economic fluctuations. This model is used to show undergraduate students how shifts in demand or shocks to prices can affect real GDP around potential. The model assumes that when inflation rises the interest rate rises (monetary policy rule).
In most circumstances the demand curve has a negative slope, and therefore slopes downwards. This is due to the law of demand which conditions that there is an inverse relationship between price and the demand of commodity (good or a service). As price goes up quantity demanded reduces and as price reduces quantity demanded increases.
In the standard aggregate supply–aggregate demand model, real output (Y) is plotted on the horizontal axis and the price level (P) on the vertical axis. The levels of output and the price level are determined by the intersection of the aggregate supply curve with the downward-sloping aggregate demand curve.
Thus, some argue that the law of demand is violated in such cases. In this case, the demand curve does not slope down from left to right; instead, it presents a backward slope from the top right to down left. This curve is known as an exceptional demand curve.
The number of enterprises is small, entry and exit from the market are restricted, product attributes are different, and the demand curve is downward sloping and relatively inelastic. Oligopolies are usually found in industries in which initial capital requirements are high and existing companies have strong foothold in market share. Monopoly:
Oligopolies generally rely on non-price weapons, such as advertising or changes in product characteristics. Several large companies hold large market shares in industrial production, each facing a downward sloping demand, and the industry is often characterized by extensive non-price competition.