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| [[File:AS + AD graph.svg|right|thumb|300px|Aggregate supply/demand graph]]
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| The '''AD–AS''' or '''aggregate demand–aggregate supply model''' is a [[macroeconomic model]] that explains [[price level]] and [[output (economics)|output]] through the relationship of [[aggregate demand]] and [[aggregate supply]]. It is based on the theory of [[John Maynard Keynes]] presented in his work ''[[The General Theory of Employment, Interest, and Money]]''. It is one of the primary simplified representations in the modern field of [[macroeconomics]], and is used by a broad array of economists, from [[Libertarianism|libertarian]], [[Monetarist]] supporters of [[laissez-faire]], such as [[Milton Friedman]] to [[Post-Keynesian economics|Post-Keynesian]] supporters of [[economic interventionism]], such as [[Joan Robinson]].
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| The conventional "aggregate supply and demand" model is, in actuality, a Keynesian visualization that has come to be a widely accepted image of the theory. The Classical supply and demand model, which is largely based on [[Say's law]], or that supply creates its own demand, depicts the aggregate supply curve as being vertical at all times (not just in the long-run)
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| ==Modeling==
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| The AD/AS model is used to illustrate the [[Keynesian economics|Keynesian]] model of the [[business cycle]]. Movements of the two curves can be used to predict the effects that various [[exogeny|exogenous]] events will have on two variables: real [[GDP]] and the [[price level]]. Furthermore, the model can be incorporated as a component in any of a variety of dynamic models (models of how variables like the price level and others evolve over time). The AD–AS model can be related to the [[Phillips curve]] model of wage or price inflation and unemployment.
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| ==Aggregate demand curve==
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| {{main|Aggregate Demand}}
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| The AD curve is defined by the IS–LM equilibrium income at different potential price levels.
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| The Aggregate demand curve AD, which is downward sloping, is derived from the [[IS/LM model]].
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| [[File:AS AD.png|thumb|IS–LM curve]]
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| [[File:AS AD (2).png|thumb|AD–AS curve]]
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| It shows the combinations of the price level and level of the output at which the goods and assets markets are simultaneously in equilibrium.
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| The above figure showing IS and LM curves, where LM curve shifts downward to the right to LM’ and thus shifting the new equilibrium to E’ where both goods and money market gets cleared. Now, the new output level Y’ correspond to the lower price level P’.
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| Thus a reduction in price, which is shown in the figure, leads to an increase in the equilibrium and spending.
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| The equation for the AD curve in general terms is:
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| : <math>Y=Y^{d}(\tfrac{M}{P}, G, T, Z_1)</math>
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| where Y is real [[GDP]], M is the nominal [[money supply]], P is the [[price level]], G is real [[government spending]], T is an exogenous component of real taxes levied, and Z<sub>1</sub> is a vector of other exogenous variables that affect the location of the IS curve (exogenous influences on any component of spending) or the LM curve (exogenous influences on money demand). The real money supply has a positive effect on aggregate demand, as does real government spending (meaning that when the independent variable changes in one direction, aggregate demand changes in the same direction); the exogenous component of taxes has a negative effect on it.
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| ==Slope of AD curve==
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| The slope of AD curve reflects the extent to which the real balances change the equilibrium level of spending, taking both assets and goods markets into consideration.
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| '''An increase in real balances will lead to a larger increase in equilibrium income and spending, the smaller the interest responsiveness of money demand and the higher the interest responsiveness of investment demand.'''
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| '''An increase in real balances leads to a larger level of income and spending, the larger the value of multiplier and the smaller the income response of money demand.'''
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| This implies that:
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| The AD curve is flatter, smaller is the interest responsiveness of the [[demand for money]] and larger is the interest responsiveness of investment demand.
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| Also, the AD curve is flatter, the larger is the multiplier and the smaller the income responsiveness of the demand for money.
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| ==Effect of monetary expansion on the AD curve==
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| [[File:AD-AS model.png|thumb|Aggregate demand curve shifts rightward in case of a monetary expansion]]
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| An increase in the nominal money stock leads to a higher real money stock at each level of prices. In the asset market, the decrease in interest rates induces the public to hold higher real balances. It stimulates the aggregate demand and thereby increases the equilibrium level of income and spending.Thus, as we can see from the diagram, the aggregate demand curve shifts rightward in case of a monetary expansion.
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| ==Aggregate supply curve==
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| {{main|Aggregate supply}}
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| The aggregate supply curve may reflect either labor market disequilibrium or labor market equilibrium. In either case, it shows how much output is supplied by firms at various potential price levels. The aggregate supply curve (AS curve) describes for each given price level, the quantity of output the firms plan to supply.
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| The '''Keynesian aggregate supply curve''' shows that the AS curve is significantly horizontal implying that the firm will supply whatever amount of goods is demanded at a particular price level during an [[economic depression]]. The idea behind that is because there is unemployment, firms can readily obtain as much labour as they want at that current wage and production can increase without any additional costs (e.g. machines are idle which can simply be turned on). Firms' average costs of production therefore are assumed not to change as their output level changes. This provides a rationale for Keynesians' support for government intervention. The total output of an economy can decline without the price level declining; this fact, in conjunction with the Keynesian belief of wages being inflexible downwards, clarifies the need for government stimulus. Since wages cannot readily adjust low enough for aggregate supply to shift outward and improve total output, the government must intervene to accomplish this result. However, the Keynesian aggregate supply curve also contains a normally upward-sloping region where aggregate supply responds accordingly to changes in price level. The upward slope is due to the [[law of diminishing returns]] as firms increase output, which states that it will become marginally more expensive to accomplish the same level of improvement in productive capacity as firms grow. It is also due to the scarcity of natural resources, the rarity of which causes increased production to also become more expensive. The vertical section of the Keynesian curve corresponds to the physical limit of the economy, where it is impossible to increase output.
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| The ''classical aggregate supply curve'' comprises a short-run aggregate supply curve and a vertical long-run aggregate supply curve. The short-run curve visualizes the total planned output of goods and services in the economy at a particular price level. The "short-run" is defined as the period during which only final good prices adjust and factor, or input, costs do not. The "long-run" is the period after which factor prices are able to adjust accordingly. The short-run aggregate supply curve has an upward slope for the same reasons the Keynesian AS curve has one: the law of diminishing returns and the scarcity of resources. The long-run aggregate supply curve is vertical because factor prices will have adjusted. Factor prices increase if producing at a point beyond full employment output, shifting the short-run aggregate supply inwards so equilibrium occurs somewhere along full employment output. Monetarists have argued that demand-side expansionary policies favoured by Keynesian economists are solely inflationary. As the aggregate demand curve is shifted outward, the general price level increases. This increased price level causes households, or the owners of the [[factors of production]] to demand higher prices for their goods and services. The consequence of this is increased production costs for firms, causing short-run aggregate demand to shift back inwards. The theoretical ultimate result is inflation.<ref>{{cite book |last=Glanville |first=Alan |title=Economics From a Global Perspective |edition=Third |publisher=Glanville Books |year=2011 |page=224 |isbn=9780952474685 }}</ref> | |
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| ===Shifts in aggregate supply curves===
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| The Keynesian model, in which there is no long-run aggregate supply curve and the classical model, in the case of the short-run aggregate supply curve, are affected by the same determinants. Any event that results in a change of production costs shifts the curves outwards or inwards if production costs are decreased or increased, respectively. Some factors which affect short-run production costs include: taxes and subsidies, price of labour (wages), and price of raw materials. These factors shift short-run curves ''exclusively''. Changes in the quantity and quality of labour and capital affect both long-run and short-run supply curves. A greater quantity of labour or capital corresponds to a lower price for both. A greater quality in labour or capital corresponds to a greater output per worker or machine.
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| The long-run aggregate supply curve of the classical model is affected by events that affect the [[potential output]] of the economy. Factors revolve around changes in the quality and quantity of factors of production.
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| ==Fiscal and monetary policy under Classical and Keynesian cases==
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| Keynesian Case:
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| If there is a fiscal expansion i.e. there is an increase in the government spending or a cut in the taxes, it will shift the AD curve rightwards. The shift would then imply an increase in the equilibrium output and employment.
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| In the Classical case, the AS curve is vertical at the full employment level of output. Firms will supply the equilibrium level of output whatever the price level may be.
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| Now, the fiscal expansion shifts the AD curve rightwards, thus leading to an increase in the demand for goods, but the firms cannot increase the output as there is no labour force which can be obtained.
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| As firms try to hire more labour, they bid up wages and their costs of production and thus they charge higher prices for the output.
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| The increase in prices reduces the real money stock and leads to an increase in the interest rates and reduction in spending.
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| The equation for the aggregate supply curve in general terms for the case of excess supply in the labor market, called the short-run aggregate supply curve, is
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| :<math>Y=Y^{s}(W/P, \ \ P/P^{e}, \ \ Z_2)</math>
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| where W is the nominal wage rate (exogenous due to stickiness in the short run), P<sup>e</sup> is the anticipated (expected) price level, and Z<sub>2</sub> is a vector of exogenous variables that can affect the position of the labor demand curve (the capital stock or the current state of technological knowledge). The real wage has a negative effect on firms' employment of labor and hence on aggregate supply. The price level relative to its expected level has a positive effect on aggregate supply because of firms' mistakes in production plans due to mis-predictions of prices.
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| The long-run aggregate supply curve refers not to a time frame in which the capital stock is free to be set optimally (as would be the terminology in the micro-economic theory of the firm), but rather to a time frame in which wages are free to adjust in order to equilibrate the labor market and in which price anticipations are accurate. In this case the nominal wage rate is endogenous and so does not appear as an independent variable in the aggregate supply equation. The long-run aggregate supply equation is simply
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| :<math>Y=Y^{s}(Z_2)</math>
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| and is vertical at the full-employment level of output. In this long-run case, Z<sub>2</sub> also includes factors affecting the position of the labor supply curve (such as population), since in labor market equilibrium the location of labor supply affects the labor market outcome.
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| ==Shifts of aggregate demand and aggregate supply==
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| The following summarizes the exogenous events that could shift the aggregate supply or aggregate demand curve to the right. Exogenous events happening in the opposite direction would shift the relevant curve in the opposite direction.
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| ===Shifts of aggregate demand===
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| The following exogenous events would shift the aggregate demand curve to the right. As a result, the price level would go up. In addition if the time frame of analysis is the short run, so the aggregate supply curve is upward sloping rather than vertical, real output would go up; but in the long run with aggregate supply vertical at full employment, real output would remain unchanged.
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| Aggregate demand shifts emanating from the IS curve:
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| * An exogenous increase in consumer spending
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| * An exogenous increase in investment spending on [[physical capital]]
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| * An exogenous increase in intended inventory investment
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| * An exogenous increase in government spending on goods and services
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| * An exogenous increase in [[transfer payments]] from the government to the people
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| * An exogenous decrease in taxes levied
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| * An exogenous increase in purchases of the country's exports by people in other countries
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| * An exogenous decrease in imports from other countries
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| Aggregate demand shifts emanating from the LM curve:
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| * An exogenous increase in the nominal money supply
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| * An exogenous decrease in the demand for money supply i.e. liquidity preference
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| ===Shifts of aggregate supply===
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| The following exogenous events would shift the short-run aggregate supply curve to the right. As a result, the price level would drop and real GDP would increase. | |
| * An exogenous decrease in the wage rate
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| * An increase in the physical capital stock
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| * Technological progress — improvements in our knowledge of how to transform capital and labor into output
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| The following events would shift the long-run aggregate supply curve to the right:
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| * An increase in population
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| * An increase in the physical capital stock
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| * Technological progress
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| ==Monetarism==
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| The modern quantity theory states that the price level is directly affected by the quantity of money.
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| Friedman is the recognized intellectual leader of an influential group of economists, called Monetarists, who emphasize the role of money and monetary policy in affecting the behaviour of output and prices.
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| Modern quantity theory also disagrees with the strict quantity theory in not believing that the supply curve is vertical in the short run.
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| Thus, Friedman and other monetarists made an important distinction between the short run and long run effects of changes in money. They said that in the long run money is more or less neutral. Changes in real money stock have no real effects and only change prices. But in the short run, they argue that the monetary policy and changes in the money stock can have important real effects.
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| ==See also==
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| * [[AD–IA model]]
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| * [[Classical dichotomy]]
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| * [[DAD–SAS model]]
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| ==References==
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| {{reflist}}
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| *Mankiw N.Gregory(2008), Worth Publishers, New York
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| *Olivier Blanchard, Fourth Edition, Pearson Education Inc.
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| ===Scholarly articles===
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| * Dutt, Amitava K.and Skott, Peter. [http://www.umass.edu/economics/publications/2005-11.pdf "Keynesian Theory and the AD-AS Framework: A Reconsideration,"] Working Papers 2005–11, University of Massachusetts Amherst, Department of Economics. 2005.
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| * Palley, Thomas I. [http://findarticles.com/p/articles/mi_qa3620/is_199710/ai_n8761314 "Keynesian theory and AS/AD analysis"]{{dead link|date=March 2013}}. ''Eastern Economic Journal'', Fall 1997.
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| * Amitava Krishna Dutt and Skott, Peter. [http://www.findarticles.com/p/articles/mi_qa3620/is_199607/ai_n8742630 "Keynesian Theory and the Aggregate-Supply/Aggregate-Demand Framework: A Defense,"]{{dead link|date=March 2013}} Eastern Economic Journal, Eastern Economic Association, vol. 22(3), pages 313–331, Summer 1996.
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| ==External links==
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| {{commons category|Aggregate supply and demand curves}}
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| * [http://www.sparknotes.com/economics/macro/aggregatesupply/section3.rhtml Sparknotes: Aggregate Supply and Aggregate Demand] brief explanation of the AD–AS model
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| * [http://ingrimayne.com/econ/optional/ISLM/Aggregate.html "Aggregate Demand and Aggregate Supply" in ''CyberEconomics'' by Robert Schenk] explains the AD–AS model and explains its relation to the IS/LM model
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| * [http://www.whitenova.com/thinkEconomics/simul.html "ThinkEconomics: Macroeconomic Phenomena in the AD/AS Model"] includes an interactive graph demonstrating inflationary changes in a graph based on the AD–AS model
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| * [http://www.whitenova.com/thinkEconomics/adas.html "ThinkEconomics: The Aggregate Demand and Aggregate Supply Model"] includes an interactive AD-AS graph that tests one's knowledge of how the AD and AS curves shift under different conditions
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| {{DEFAULTSORT:AD-AS model}}
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| [[Category:John Maynard Keynes]]
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| [[Category:Macroeconomics]]
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| [[Category:Economics models]]
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| [[Category:Economics curves]]
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| {{Link GA|de}}
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First understand, its maybe not about you. What I mean by that statement is that it"s not about guilt and what some think may be the Right thing to do. Its not about holding onto someone that they used to be. They"re an elderly person needing constant care and attention. This situation will make it happen whether youre ready or not, If you need an amount of growing up!
Start with their doctor. Have a scheduled appointment to go over the health of one"s beloved parent. You may also look into a medical facility that their healthcare is related. Every hospital has an elder care band of some kind. The medical coverage may also have affiliations with parent finding. Between the medical insurance party and the doctor, maybe you are able to determine the forms of support and living style your parents recent status requires. Keep asking before you have the very best situation for all concerned.
It might be as simple as an Aide visiting a few times every day to help with dressing, bathing, foods and meds. Their health may need more than that and the visiting nurse or doctors company is the destination for a implement the matter. The top term to understand to help an elder parent is the same as if your toddler child were being maintained and that"s SAFETY. Keep driving until you have the help you need, if safety isn"t at the level necessary. Continue requiring the area of SAFETY.
It usually takes you time to uncover everything available to your parent to help with this particular care approach but trust me, it will be worth it in the many years elder care can stretch out to be. It"s better to check with them their health and medical, financial and personal circumstances before that day arrives.
Once they are older a good thing you will give them is you. Spend quality time in place of pressure time. Have them over for a day and meal as opposed to having to pawn them off on someone else. The bitterness builds if you do this alone and there are numerous excellent care facilities to simply take that load off your shoulders. Learn further about close remove frame by browsing our riveting article.
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