Tag: aggregate demand and supply

With the imposition of a new lockdown in England from 5 November to 2 December and in Wales from 3 October to 9 November, and with strong restrictions in Scotland and Northern Ireland, the UK economy is set to return to negative growth – a W-shaped GDP growth curve.

With the closure of leisure facilities and non-essential shops in England and Wales, spending is likely to fall. Without support, many businesses would fail and potential output would fall. In terms of aggregate demand and supply, both would decline, as the diagram below illustrates. (Click here for a PowerPoint.)

The aggregate demand curve shifts from AD1 to AD2 as consumption and investment fall. Exports also fall as demand is hit by the pandemic in other countries. The fall in aggregate supply is represented partly by a movement along the short-run aggregate supply curve (SRAS) as demand falls for businesses which remain open (such as transport services). Largely it is represented by a leftward shift in the curve from SRAS1 to SRAS2 as businesses such as non-essential shops and those in the hospitality and leisure sector are forced to close. What happens to the long-run supply curve depends on the extent to which businesses reopen when the lockdown and any other subsequent restrictions preventing their reopening are over. It also depends on the extent to which other firms spring up or existing firms grow to replace the business of those that have closed. The continuing rise in online retailing is an example.

With the prospect of falling GDP and rising unemployment, the UK government and the Bank of England have responded by giving a fiscal and monetary boost. We examine each in turn.

Fiscal policy

In March, the Chancellor introduced the furlough scheme, whereby employees temporarily laid off would receive 80% of their wages through a government grant to their employers. This scheme was due to end on 31 October, to be replaced by the less generous Job Support Scheme (see the blog, The new UK Job Support Scheme: how much will it slow the rise in unemployment?). However, the Chancellor first announced that the original furlough scheme would be extended until 2 December for England and then, on 5 November, to the end of March 2021 for the whole of the UK. He also announced that the self-employed income support grant would increase from 55% to 80% of average profits up to £7500.

In addition, the government announced cash grants of up to £3000 per month for businesses which are closed (worth more than £1 billion per month), extra money to local authorities to support businesses and an extension of existing loan schemes for business. Furthermore, the government is extending the scheme whereby people can claim a repayment ‘holiday’ for up to 6 months for mortgages, personal loans and car finance.

The government hopes that the boost to aggregate demand will help to slow, or even reverse, the predicted decline in GDP. What is more, by people being put on furlough rather than being laid off, it hopes to slow the rise in unemployment.

Monetary policy

At the meeting of the Bank of England’s Monetary Policy Committee on 4 November, further expansionary monetary policy was announced. Rather than lowering Bank Rate from its current historically low rate of 0.1%, perhaps to a negative figure, it was decided to engage in further quantitative easing.

An additional £150 billion of government bonds will be purchased under the asset purchase facility (APF). This will bring the total vale of bonds purchased since the start of the pandemic to £450 billion (including £20 billion of corporate bonds) and to £895 billion since 2009 when QE was first introduced in response to the recession following the financial crisis of 2007–8.

The existing programme of asset purchases should be complete by the end of December this year. The Bank of England expects the additional £150 billion of purchases to begin in January 2021 and be completed within a year.

UK quantitative easing since the first round in March 2009 is shown in the chart above. The reserve liabilities represent the newly created money for the purchase of assets under the APF programme. (There are approximately £30 billion of other reserve liabilities outside the APF programme.) The grey area shows projected reserve liabilities to the end of the newly announced programme of purchases, by which time, as stated above, the total will be £895 billion. This, of course, assumes that the Bank does not announce any further QE, which it could well do if the recovery falters.

Justifying the decision, the MPC meeting’s minutes state that:

There are signs that consumer spending has softened across a range of high-frequency indicators, while investment intentions have remained weak. …The fall in activity over 2020 has reflected a decline in both demand and supply. Overall, there is judged to be a material amount of spare capacity in the economy.


How effective these fiscal and monetary policy measures will be in mitigating the effects of the Covid restrictions remains to be seen. A lot will depend on how successful the lockdown and other restrictions are in slowing the virus, how quickly a vaccine is developed and deployed, whether a Brexit deal is secured, and the confidence of both consumers, businesses and financial markets that the economy will bounce back in 2021. As the MPC’s minutes state:

The outlook for the economy remains unusually uncertain. It depends on the evolution of the pandemic and measures taken to protect public health, as well as the nature of, and transition to, the new trading arrangements between the European Union and the United Kingdom. It also depends on the responses of households, businesses and financial markets to these developments.


Official documents


  1. Illustrate the effects of expansionary fiscal and monetary policy on (a) a short-run aggregate supply and demand diagram; (b) a long-run aggregate supply and demand diagram.
  2. In the context of the fiscal and monetary policy measures examined in this blog, what will determine the amount that the curves shift?
  3. Illustrate on a Keynesian 45° line diagram the effects of (a) the lockdown and (b) the fiscal and monetary policy measures adopted by the government and Bank of England.
  4. If people move from full-time to part-time working, how is this reflected in the unemployment statistics? What is this type of unemployment called?
  5. How does quantitative easing through asset purchases work through the economy to affect output and employment? In other words, what is the transmission mechanism of the policy?
  6. What determines the effectiveness of quantitative easing?
  7. Under what circumstances will increasing the money supply affect (a) real output and (b) prices alone?
  8. Why might quantitative easing benefit the rich more than the poor?
  9. How could the government use quantitative easing to finance its budget deficit?

With promises by the newly elected Conservative government to increase investment expenditure on health, education, innovation and infrastructure, it was expected that Rishi Sunak’s first Budget would be strongly expansionary. In fact, it turned out to be two Budgets in one – both giving a massive fiscal boost.

An emergency Budget

The first part of the Budget was a short-term emergency response to the explosive spread of the coronavirus. An extra £12 billion is to be spent on the NHS and other public services. Whether this will be anything like enough to cope with the effects of the pandemic as businesses fail and people lose their jobs remains to be seen. (See the blog A global supply-side shock: the impact of the coronavirus (COVID-19) outbreak.)

A key issue is just how quickly the money can be spent. How quickly can you train health professionals or produce more ventilators or provide extra hospital beds?

This emergency part of the Budget was co-ordinated with the Bank of England’s decision to cut Bank Rate from 0.75% to 0.25%.

This combined fiscal and monetary response to the crisis was further enhanced by the agreement of central banks on 15 March to boost world liquidity by increasing the supply of US dollars through large-scale quantitative easing. The US central bank, the Federal Reserve, also cut its main federal funds rate by one percentage point from 1–1.25% to 0–0.25%.

The planned Budget

The second part of the Budget is to raise government investment by 9% in real terms over the next four years, bringing overall government expenditure to 41% of GDP, financed largely by extra borrowing. As the IFS observes, “That is above its pre-crisis level and bigger than at any point between the mid 1980s and the start of the financial crisis.”

But despite this rise in the proportion of government spending to GDP, in other respects the spending plans are less expansionary than they may appear. Increases in current spending on health, education and defence had already been promised. This leaves other departments, such as social security, facing cuts, or at least no increase. And when compared with 2010/11 levels, if you exclude health, government current spending per head of the population will around 14% lower, or 19% lower once you account for spending that replaces EU funding.

The Chancellor’s hope is that, by focusing on investment, there will be a supply-side effect as well as a demand-side boost. If increases in aggregate demand are balanced by increases in aggregate supply, such a policy would not be inflationary in the long run. But in the light of the considerable uncertainty of the effects of the coronavirus, the plans may well require significant adjustment in the Autumn Budget – or earlier.


Podcasts and Videos

Official documentation


  1. To what extent is this Budget ‘Keynesian’?
  2. Is the extra government expenditure likely to crowd out private expenditure? Explain.
  3. Demonstrate the desired long-term economic effect of the infrastructure policy using either an AD/AS diagram or a DAD/DAS diagram.
  4. How is the coronavirus pandemic likely to affect potential GDP in (a) the short run (b) the long run?
  5. Why is public-sector debt likely to soar over the next four years while annual government debt interest payments are likely to continue their gentle decline?
  6. What is missing from the Budget that you feel ought to have been included? Explain why.

The demand for oil is growing and yet the price of oil, at around $46 per barrel over the past few weeks, remains at less than half that of the period from 2011 to mid 2014. The reason is that supply has been much larger than demand. The result has been a large production surplus and a growth in oil stocks. Supply did fall somewhat in October, which reduced the surplus in 2015 Q3 below than of the record level in Q2 – but the surplus was still the second highest on record.

What is more, the modest growth in demand is forecast to slow in 2016. Supply, however, is expected to decrease through the first three quarters of 2016, before rising again at the end of 2016. The result will be a modest rise in price into 2016, to around $56 per barrel, compared with an average of just over $54 per barrel so far for 2015 (click here for a PowerPoint of the chart below).

But why does supply remain so high, given such low prices? As we saw in the post The oil industry and low oil prices, it is partly the result of increases in supply from large-scale investment in new sources of oil over the past few years, such as the fracking of shale deposits, and partly the increased output by OPEC designed to keep prices low and make new investment in shale oil unprofitable.

So why then doesn’t supply drop off rapidly? As we saw in the post, A crude indicator of the economy (Part 2), even though shale oil producers in the USA need a price of around $70 or more to make investment in new sources profitable, the marginal cost of extracting oil from existing sources is only around $10 to £20 per barrel. This means that shale oil production will continue until the end of the life of the wells. Given that wells typically have a life of at least three years, it could take some time for the low prices to have a significant effect on supply. According to the US Energy Information Administration’s forecasts, US crude oil production will drop next year by only just over 5%, from an average of 9.3 million barrels per day in 2015 to 8.8 million barrels per day in 2016.

In the meantime, we can expect low oil prices to continue for some time. Whilst this is bad news for oil exporters, it is good news for oil importing countries, as the lower costs will help aid recovery.


IEA says oil glut could worsen through 2016 Euronews (13/11/15)
IEA Says Record 3 Billion-Barrel Oil Stocks May Deepen Rout BloombergBusiness, Grant Smith (13/11/15)


IEA Offers No Hope For An Oil-Price Recovery Forbes, Art Berman (13/11/15)
Oil glut to swamp demand until 2020 Financial Times, Anjli Raval (10/11/15)
Record oil glut stands at 3bn barrels BBC News (13/11/15)
Global oil glut highest in a decade as inventories soar The Telegraph, Mehreen Khan (12/11/15)
The Oil Glut Was Created In Q1 2015; Q3 OECD Inventory Movements Are Actually Quite Normal Seeking Alpha (13/11/15)
Record oil glut stands at 3 billion barrels Arab News (14/11/15)
OPEC Update 2015: No End To Oil Glut, Low Prices, As Members Prepare For Tense Meeting International Business Times, Jess McHugh (12/11/15)
Surviving The Oil Glut Investing.com, Phil Flynn (11/11/15)

Reports and data

Oil Market Report International Energy Agency (IEA) (13/11/15)
Short-term Energy Outlook US Energy Information Administration (EIA) (10/11/15)
Brent Crude Prices US Energy Information Administration (EIA)


  1. Using demand and supply diagrams, demonstrate (a) what has been happening to oil prices in 2015 and (b) what is likely to happen to them in 2016.
  2. How are the price elasticities of demand and supply relevant in explaining the magnitude of oil price movements?
  3. What are oil prices likely to be in five years’ time?
  4. Using aggregate demand and supply analysis, demonstrate the effect of lower oil prices on a national economy.
  5. Why might the downward effect on inflation from lower oil prices act as a stimulus to the economy? Is this consistent with deflation being seen as requiring a stimulus from central banks, such as lower interest rates or quantitative easing?
  6. Do you agree with the statement that “Saudi Arabia is acting directly against the interests of half the cartel and is running OPEC over a cliff”?
  7. If the oil price is around $70 per barrel in a couple of years’ time, would it be worth oil companies investing in shale oil wells at that point? Explain why or why not.
  8. Distinguish between short-run and long-run shut down points. Why is the short-run shut down price likely to be lower than the long-run one?