In economics, aggregate supply ( AS) or domestic final supply ( DFS) is the total supply of goods and services that firms in a national economy plan on selling during a specific time period. It is the total amount of goods and services that firms are willing and able to sell at a given price level in an economy. Together with aggregate demand it serves as one of two components for the AD–AS model.
Analysis
- The short-run AS curve is drawn given some nominal variables such as the nominal wage rate, which is assumed fixed in the short run. Thus, a higher price level P implies a lower real wage rate and thus an incentive to produce more output. In the neoclassical long run, on the other hand, the nominal wage rate varies with economic conditions. (High unemployment leads to falling nominal wages which restore full employment.) Hence, in the long run, the aggregate supply curve is vertical.
- An alternative model starts with the notion that any economy involves a large number of heterogeneous types of inputs, including both fixed capital equipment and labour. Both main types of inputs can be unemployed. The upward-sloping AS curve arises because (1) some nominal input prices are fixed in the short run and (2) as output rises, more and more production processes encounter bottlenecks. At low levels of demand, there are large numbers of production processes that do not use their fixed capital equipment fully. Thus, production can be increased without much in the way of diminishing returns and the average price level need not rise much (if at all) to justify increased production. The AS curve is flat. On the other hand, when demand is high, few production processes have unemployed fixed inputs. Thus, bottlenecks are general. Any increase in demand and production induces increases in prices. Thus, the AS curve is steep or vertical.
Different scopes
- Short-run aggregate supply (SRAS) — During the short-run, firms possess one fixed factor of production (usually capital), and some factor input prices are sticky. The quantity of aggregate output supplied is highly sensitive to the price level, as seen in the flat region of the curve in the above diagram.
- Long-run aggregate supply (LRAS) — Over the long run, only capital, labour, and technology affect the LRAS in the macroeconomic model because at this point everything in the economy is assumed to be used optimally. In most situations, the LRAS is viewed as static because it shifts the slowest of the three. The LRAS is shown as perfectly vertical, reflecting economists' belief that changes in aggregate demand (AD) have an only temporary change on the economy's total output.
- Medium run aggregate supply (MRAS) — As an interim between SRAS and LRAS, the MRAS form slopes upward and reflects when capital, as well as labor usage, can change. More specifically, medium run aggregate supply is like this for three theoretical reasons, namely the Sticky-Wage Theory, the Sticky-Price Theory and the Misperception Theory. The position of the MRAS curve is affected by capital, labour, technology, and wage rate.
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.
Data
Policy interventions
Continuing "supply-side reforms" were proposed by Liz Truss and Chancellor Kwasi Kwarteng as part of their 2022 economic programme,Elliott, L., How is Liz Truss's government challenging 'Treasury orthodoxy'?, The Guardian, published 13 September 2022, accessed 14 September 2022HM Treasury, Chancellor Kwasi Kwarteng sets out economic priorities in first meeting with market leaders, updated 7 September 2022, accessed 14 September 2022 with reference to "a comprehensive package of supply-side reform and tax cuts" being made in the Growth Plan announced on 23 September 2022, and further supply side growth measures promised for October and early November, including measures affecting the planning system, business regulation, childcare, immigration, agricultural productivity and digital infrastructure. However, Larry Elliott in The Guardian has described this combination of reforms, reduced regulation and tax cuts as "one huge gamble".Elliott, L., History suggests Kwarteng's gargantuan economic gamble won't end well, The Guardian, published 23 September 2022, accessed 26 September 2022 The September Growth Plan commitments were mostly reversed by the Autumn Statement of 17 November 2022, although a limited number of initiatives relating to "supply side growth" were included in the latter statement.HM Treasury, Autumn Statement 2022, sections 2.4, 5.70-5.75, published 17 November 2022, accessed 18 November 2022
Within the UK government, HM Treasury's work on "the supply side" is led by the Enterprise and Growth Unit,House of Commons Treasury Committee, Oral evidence: the work of the Treasury, HC 912, statement by Tom Scholar, published 1 December 2021, accessed 21 September 2022 working in conjunction with other government departments and public bodies.HM Treasury Careers, Role of HM Treasury, accessed 23 September 2022 Sir John Kingman, a former civil servant who has been described as the "champion of HM Treasury's supply-side activism",Ross, M., John Kingman, champion of HM Treasury's supply-side activism, warns of Brexit threat, Global Government Forum, published 24 October 2016, accessed 21 September 2022 has referred to concern with "the supply side" as the "third mission" of the Treasury,Kingman, J., The Treasury and the Supply Side , a lecture given for the Strand Group, an arm of the Policy Institute at King's College London, October 2016, accessed 21 September 2022 presenting former Chancellor of the Exchequer Nigel Lawson as a notable example of "those who believe in the importance of supply-side reform".
"Supply-side pessimism" reflects a concern that productive capacity is lost when unused (e.g. during a recession), so that the economy loses the ability to recover aggregate supply when demand recovers. For example, unused factories are not kept in a state of readiness to be used when an economic upturn begins, or workers miss out on the skills and training which they would normally acquire whilst in work.Jones, C., Cohen, N., Battle rages over supply shock risks to economy, Financial Times, 5 June 2012, accessed 26 August 2022 Spencer Dale, a British economist who sat on the Bank of England's Monetary Policy Committee between 2008 and 2014, took a pessimistic view of supply-side capabilities during the recession of 2012. Cambridge economist Bill Martin reported on productivity pessimism in 2012, noting that there was an established debate about whether there had been a permanent loss of productive capacity,Martin, B., Is the British economy supply constrained? A critique of productivity pessimism, published July 2011, accessed 26 August 2022 which was reflected as a continuing level of "uncertainty ... related to the prospects for labour productivity and effective supply" as the economy recovered in 2013.Monetary Policy Committee of the Bank of England, Minutes of the meeting held on 31 July and 1 August 2013, published 14 August 2013, accessed 26 August 2022
See also
- Aggregate demand
- Aggregation problem
- Disequilibrium
- Economic surplus
- Effective demand
- Shortage
- Excess demand function
- Excess supply
- Induced demand
- Keynesian formula
- Reproduction
- Scarcity
- Supply and demand
- Supply shock
- Paul Krugman; Robin Wells; Martha Olney (2007). Essentials of Economics. New York: Worth. .
External links
- Elmer G. Wiens: Classical & Keynesian AD–AS Model – an on-line, interactive model of the Canadian Economy
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