Tag: multiplier

On 10 March, the House of Representatives gave final approval to President Biden’s $1.9tr fiscal stimulus plan (the American Rescue Plan). Worth over 9% of GDP, this represents the third stage of an unparalleled boost to the US economy. In March 2020, President Trump secured congressional agreement for a $2.2tr package (the CARES Act). Then in December 2020, a bipartisan COVID relief bill, worth $902bn, was passed by Congress.

By comparison, the Obama package in 2009 in response to the impending recession following the financial crisis was $831bn (5.7% of GDP).

The American Rescue Plan

The Biden stimulus programme consists of a range of measures, the majority of which provide monetary support to individuals. These include a payment of $1400 per person for single people earning less than $75 000 and couples less than $150 000. These come on top of payments of $1200 in March 2020 and $600 in late December. In addition, the top-up to unemployment benefits of $300 per week agreed in December will now continue until September. Also, annual child tax credit will rise from $2000 annually to as much as $3600 and this benefit will be available in advance.

Other measures include $350bn in grants for local governments depending on their levels of unemployment and other needs; $50bn to improve COVID testing centres and $20bn to develop a national vaccination campaign; $170bn to schools and universities to help them reopen after lockdown; and grants to small businesses and specific grants to hard-hit sectors, such as hospitality, airlines, airports and rail companies.

Despite supporting the two earlier packages, no Republican representative or senator backed this latest package, arguing that it was not sufficiently focused. As a result, reaction to the package has been very much along partisan lines. Nevertheless, it is supported by some 90% of Democrat voters and 50% of Republican voters.

Is the stimulus the right amount?

Although the latest package is worth $1.9tr, aggregate demand will not expand by this amount, which will limit the size of the multiplier effect. The reason is that the benefits multiplier is less than the government expenditure multiplier as some of the extra money people receive will be saved or used to reduce debts.

With $3tr representing some 9% of GDP, this should easily fill the estimated negative output gap of between 2% and 3%, especially when multiplier effects are included. Also, with savings having increased during the recession to put them some 7% above normal, the additional amount saved may be quite small, and wealthier Americans may begin to reduce their savings and spend a larger proportion of their income.

So the problem might be one of excessive stimulus, which in normal times could result in crowding out by driving up interest rates and dampening investment. However, the Fed is still engaged in a programme of quantitative easing. Between mid-March 2020 and the end of March 2021, the Fed’s portfolio of securities held outright grew from $3.9tr to $7.2tr. What is more, many economists predict that inflation is unlikely to rise other than very slightly. If this is so, it should allow the package to be financed easily. Debt should not rise to unsustainable levels.

Other economists argue, however, that inflationary expectations are rising, reflected in bond yields, and this could drive actual inflation and force the Fed into the awkward dilemma of either raising interest rates, which could have a significant dampening effect, or further increasing money supply, potentially leading to greater inflationary problems in the future.

A lot will depend what happens to potential GDP. Will it rise over the medium term so that additional spending can be accommodated? If the rise in spending encourages an increase in investment, this should increase potential GDP. This will depend on business confidence, which may be boosted by the package or may be dampened by worries about inflation.

Additional packages to come

Potential GDP should also be boosted by two further packages that Biden plans to put to Congress.

The first is a $2.2tr infrastructure investment plan, known as the American Jobs Plan. This is a 10-year plan to invest public money in transport infrastructure (such as rebuilding 20 000 miles of road and repairing bridges), public transport, electric vehicles, green housing, schools, water supply, green power generation, modernising the power grid, broadband, R&D in fields such as AI, social care, job training and manufacturing. This will be largely funded through tax increases, such as gradually raising corporation tax from 21% to 28% (it had been cut from 35% to 21% by President Trump) and taxing global profits of US multinationals. However, the spending will generally precede the increased revenues and thus will raise aggregate demand in the initial years. Only after 15 years are revenues expected to exceed costs.

The second is a yet-to-be announced plan to increase spending on childcare, healthcare and education. This should be worth at least $1tr. This will probably be funded by tax increases on income, capital gains and property, aimed largely at wealthy individuals. Again, it is hoped that this will boost potential GDP, in this case by increasing labour productivity.

With earlier packages, the total increase in public spending will be over $8tr. This is discretionary fiscal policy writ large.




  1. Draw a Keynesian cross diagram to show the effect of an increase in benefits when the economy is operating below potential GDP.
  2. What determines the size of the benefits multiplier?
  3. Explain what is meant by the output gap. How might the pandemic and accompanying emergency health measures have affected the size of the output gap?
  4. How are expectations relevant to the effectiveness of the stimulus measures?
  5. What is likely to determine the proportion of the $1400 stimulus cheques that people spend?
  6. Distinguish between resource crowding out and financial crowding out. Is the fiscal stimulus package likely to result in either form of crowding out and, if so, what will determine by how much?
  7. What is the current monetary policy of the Fed? How is it likely to impact on the effectiveness of the fiscal stimulus?

With the election of Joe Biden, the USA will have a president committed to tackling climate change. This is in stark contrast to Donald Trump, who has been publicly sceptical about the link between human action and climate change and has actively supported the coal, oil and gas industries and has rolled back environmental protection legislation and regulation.

What is more, in June 2017, he announced that the USA would withdraw from the UN Paris Accord, the international agreement to cut greenhouse gas emissions so as to limit global warming to ‘well below’ 2°C above pre-industrial levels with efforts to limit it to 1.5°C. The USA’s withdrawal was finalised on 4 November 2020, a day after the US election. Joe Biden, however, pledged to rejoin the accord.

A growing number of countries are pledging to achieve carbon neutrality by mid-century or earlier. The EU is planning to achieve a 55% cut in greenhouse gas emissions by 2030 so as to reach neutrality by 2050. This will involve various taxes, subsidies and public investment. Similar pledges to achieve net zero emissions by 2050 have been made by Japan and South Korea and by 2060 by China. In the UK, legislation was passed requiring the government to reduce the UK’s net emissions 100% relative to 1990 levels by 2050 and thereby achieve net zero emissions.

Constraints on action

Short-termism. One of the problems with setting targets a long time in the future is that they take away the urgency to act now. There are huge time lags between introducing policies to curb carbon emissions and their impact on the climate. The costs of such policies for business and consumers, however, are felt immediately in terms of higher taxes and/or higher prices. Thus politicians may be quick to make long-term pledges but reluctant to take firm measures today. Instead they may prefer to appease various pressure groups, such as motoring organisations, and cut fuel taxes, or, at least, not raise them. Politically, then, it may be easier to focus policy on the short term and just make pledges without action for the future.

Externalities. Various activities that cause carbon emissions, whether directly, such as heavy industry, dairy farming, aviation and shipping, or indirectly, such as oil and coal production, thereby impose environmental costs on society, both at home and abroad. These costs are negative externalities and, by their nature, are not borne by those who produce them. There are often powerful lobbies objecting to any attempt to internalise these externalities through taxes, subsidising green alternatives or regulation. Take the case of the USA. Fossil fuel producers, energy-intensive industries and farmers all claim that green policies will damage their businesses, leading to a loss of profits and jobs. These groups were courted by Donald Trump.

International competition. Countries may well be reluctant to impose green taxes or tough environmental regulation on producers, when competitors abroad do not face such constraints. Indeed, some countries are actively promoting dirty industries as part of their policies to stimulate economic recovery from the Covid-induced recession. Such countries include China, Russia and Turkey. This again was a major argument used in the Trump campaign that US industries should not be hobbled by environmental constraints but should be free to compete.

Misinformation. Politicians, knowing that taking tough environmental measures will be unpopular with large numbers of people, may well downplay the dangers of inaction. Some, such as Trump in America and Bolsonaro in Brazil deliberately appeal to climate change deniers or say that technology will sort things out. This makes it hard for other politicians to promote green policies, knowing that they will face scepticism about the science and the efficacy of their proposed policies.

Biden’s climate change policy

Although it will be difficult to persuade some Americans of the need for tougher policies to tackle climate change, Joe Biden has already made a number of pledges. He has stated that under his administration, the USA will rejoin the Paris Climate Agreement and will play a leading role in the November 2021 UN COP26 climate change conference summit in Glasgow. He has also pledged a Clean Energy Revolution to put the USA on an ‘irreversible path to achieve economy-wide net-zero emissions no later than 2050’.

But readopting the pledges under the Paris Agreement and advocating a clean energy revolution are not enough on their own. Specific measures will need to be taken. So, what can be done that is practical and likely to meet with the approval of the majority of Americans or, at least, of Biden’s supporters?

For a start, he can reintroduce many of the regulations that were overturned by the Trump administration, such as preventing oil and gas companies from flaring methane on public lands. He could introduce funding for the development of green technology. He could require public buildings to use green energy.

According to the Clean Energy Revolution, the US government will develop ‘rigorous new fuel economy standards aimed at ensuring 100% of new sales for light- and medium-duty vehicles will be zero emissions and annual improvements for heavy duty vehicles’.

One of the biggest commitments is to tackle external costs directly by enacting ‘legislation requiring polluters to bear the full cost of their climate pollution’. This may be met with considerable resistance from US corporations. It is thus politically important for Biden to stress the short-term benefits of his policies, not just the long-term ones.

Given the damage done to the economy by the spread of the pandemic, perhaps the main thing that Biden can do to persuade people of the benefits to them of his policies is to focus on green investment and green jobs. Building a green energy infrastructure of wind, solar and hydro and investing in zero-emissions vehicles and charging infrastructure will provide jobs and lead to multiplier effects throughout the economy.



  1. Identify three specific climate change policies of Joe Biden and assess whether each one is likely to succeed.
  2. Draw a diagram to illustrate why a free market will lead to over production of a good which produces negative externalities.
  3. To what extent can education internalise the positive externalities of green consumption and production?
  4. What was agreed at the Paris climate change conference in December 2015 and what mechanisms were put in place to incentivise countries to meet the targets?
  5. Will the coronavirus pandemic have had any lasting effects on emissions? Explain.
  6. How may carbon trading lead to a reduction in carbon emissions? What determines the size of such reductions?

The global economic impact of the coronavirus outbreak is uncertain but potentially very large. There has already been a massive effect on China, with large parts of the Chinese economy shut down. As the disease spreads to other countries, they too will experience supply shocks as schools and workplaces close down and travel restrictions are imposed. This has already happened in South Korea, Japan and Italy. The size of these effects is still unknown and will depend on the effectiveness of the containment measures that countries are putting in place and on the behaviour of people in self isolating if they have any symptoms or even possible exposure.

The OECD in its March 2020 interim Economic Assessment: Coronavirus: The world economy at risk estimates that global economic growth will be around half a percentage point lower than previously forecast – down from 2.9% to 2.4%. But this is based on the assumption that ‘the epidemic peaks in China in the first quarter of 2020 and outbreaks in other countries prove mild and contained.’ If the disease develops into a pandemic, as many health officials are predicting, the global economic effect could be much larger. In such cases, the OECD predicts a halving of global economic growth to 1.5%. But even this may be overoptimistic, with growing talk of a global recession.

Governments and central banks around the world are already planning measures to boost aggregate demand. The Federal Reserve, as an emergency measure on 3 March, reduced the Federal Funds rate by half a percentage point from the range of 1.5–1.75% to 1.0–1.25%. This was the first emergency rate cut since 2008.

Economic uncertainty

With considerable uncertainty about the spread of the disease and how effective containment measures will be, stock markets have fallen dramatically. The FTSE 100 fell by nearly 14% in the second half of February, before recovering slightly at the beginning of March. It then fell by a further 7.7% on 9 March – the biggest one-day fall since the 2008 financial crisis. This was specifically in response to a plunge in oil prices as Russia and Saudi Arabia engaged in a price war. But it also reflected growing pessimism about the economic impact of the coronavirus as the global spread of the epidemic accelerated and countries were contemplating more draconian lock-down measures.

Firms have been drawing up contingency plans to respond to panic buying of essential items and falling demand for other goods. Supply-chain managers are working out how to respond to these changes and to disruptions to supplies from China and other affected countries.

Firms are also having to plan for disruptions to labour supply. Large numbers of employees may fall sick or be advised/required to stay at home. Or they may have to stay at home to look after children whose schools are closed. For some firms, having their staff working from home will be easy; for others it will be impossible.

Some industries will be particularly badly hit, such as airlines, cruise lines and travel companies. Budget airlines have cancelled several flights and travel companies are beginning to offer substantial discounts. Manufacturing firms which are dependent on supplies from affected countries have also been badly hit. This is reflected in their share prices, which have seen large falls.

Longer-term effects

Uncertainty could have longer-term impacts on aggregate supply if firms decide to put investment on hold. This would also impact on the capital goods industries which supply machinery and equipment to investing firms. For the UK, already having suffered from Brexit uncertainty, this further uncertainty could prove very damaging for economic growth.

While aggregate supply is likely to fall, or at least to grow less quickly, what will happen to the balance of aggregate demand and supply is less clear. A temporary rise in demand, as people stock up, could see a surge in prices, unless supermarkets and other firms are keen to demonstrate that they are not profiting from the disease. In the longer term, if aggregate demand continues to grow at past rates, it will probably outstrip the growth in aggregate supply and result in rising inflation. If, however, demand is subdued, as uncertainty about their own economic situation leads people to cut back on spending, inflation and even the price level may fall.

How quickly the global economy will ‘bounce back’ depends on how long the outbreak lasts and whether it becomes a serious pandemic and on how much investment has been affected. At the current time, it is impossible to predict with any accuracy the timing and scale of any such bounce back.




  1. Using a supply and demand diagram, illustrate the fall in stock market prices caused by concerns over the effects of the coronavirus.
  2. Using either (i) an aggregate demand and supply diagram or (ii) a DAD/DAS diagram, illustrate how a fall in aggregate supply as a result of the economic effects of the coronavirus would lead to (a) a fall in real income and (i) a fall in the price level or (ii) a fall in inflation; (b) a fall in real income and (i) a rise in the price level or (ii) a rise in inflation.
  3. What would be the likely effects of central banks (a) cutting interest rates; (b) engaging in further quantitative easing?
  4. What would be the likely effects of governments running a larger budget deficit as a means of boosting the economy?
  5. Distinguish between stabilising and destabilising speculation. How would you characterise the speculation that has taken place on stock markets in response to the coronavirus?
  6. What are the implications of people being paid on zero-hour contracts of the government requiring workplaces to close?
  7. What long-term changes to working practices and government policy could result from short-term adjustments to the epidemic?
  8. Is the long-term macroeconomic impact of the coronavirus likely to be zero, as economies bounce back? Explain.

With many countries experiencing low growth some 12 years after the financial crisis and with new worries about the effects of the coronavirus on output in China and other countries, some are turning to a Keynesian fiscal stimulus (see Case Study 16.6 on the student website). This may be in the form of tax cuts, or increased government expenditure or a combination of the two. The stimulus would be financed by increased government borrowing (or a reduced surplus).

The hope is that there will also be a longer-term supply-side effect which will boost potential national income. This could be through tax reductions creating incentives to invest or work more efficiently; or it could be through increased capacity from infrastructure spending, whether on transport, energy, telecommunications, health or education.

In the UK, the former Chancellor, Sajid Javid, had adopted a fiscal rule similar to the Golden Rule adopted by the Labour government from 1997 to 2008. This stated that, over the course of the business cycle, the government should borrow only to invest and not to fund current expenditure. Javid’s rule was that the government would balance its current budget by the middle of this Parliament (i.e. in 2 to 3 years) but that it could borrow to invest, provided that this did not exceed 3% of GDP. Previously this limit had been set at 2% of GDP by the former Chancellor, Philip Hammond. Using his new rule, it was expected that Sajid Javid would increase infrastructure spending by some £20 billion per year. This would still be well below the extra promised by the Labour Party if they had won the election and below what many believe Boris Johnson Would like.

Sajid Javid resigned at the time of the recent Cabinet reshuffle, citing the reason that he would have been required to sack all his advisors and use the advisors from the Prime Minister’s office. His successor, the former Chief Secretary to the Treasury, Rishi Sunak, is expected to adopt a looser fiscal rule in his Budget on March 11. This would result in bigger infrastructure spending and possibly some significant tax cuts, such as a large increase in the threshold for the 40% income tax rate.

A Keynesian stimulus would almost certainly increase the short-term economic growth rate as inflation is low. However, unemployment is also low, meaning that there is little slack in the labour market, and also the output gap is estimated to be positive (albeit only around 0.2%), meaning that national income is already slightly above the potential level.

Whether a fiscal stimulus can increase long-term growth depends on whether it can increase capacity. The government hopes that infrastructure expenditure will do just that. However, there is a long time lag between committing the expenditure and the extra capacity coming on stream. For example, planning for HS2 began in 2009. Phase 1 from London to Birmingham is currently expected to be operation not until 2033 and Phase 2, to Leeds and Manchester, not until 2040, assuming no further delays.

Crossrail (the new Elizabeth line in London) has been delayed several times. Approved in 2007, with construction beginning in 2009, it was originally scheduled to open in December 2018. It is now expected to be towards the end of 2021 before it does finally open. Its cost has increased from £14.8 billion to £18.25 billion.

Of course, some infrastructure projects are much quicker, such as opening new bus routes, but most do take several years.

The first five articles look at UK policy. The rest look at Keynesian fiscal policies in other countries, including the EU, Russia, Malaysia, Singapore and the USA. Governments seem to be looking for a short-term boost to aggregate demand that will increase short-term GDP, but also have longer-term supply-side effects that will increase the growth in potential GDP.



  1. Illustrate the effect of an expansionary fiscal policy with a Keynesian Cross (income and expenditure) diagram or an injections and withdrawals diagram.
  2. What is meant by the term ‘output gap’? What are the implications of a positive output gap for expansionary Keynesian policy?
  3. Assess the benefits of having a fiscal rule that requires governments to balance the current budget but allows borrowing to invest.
  4. Would there be a problem following such a rule if there is currently quite a large positive output gap?
  5. To what extent are the policies being proposed in Russia, the EU, Malaysia and Singapore short-term demand management policies or long-term supply-side policies?

Both the financial and goods markets are heavily influenced by sentiment. And such sentiment tends to be self-reinforcing. If consumers and investors are pessimistic, they will not spend and not invest. The economy declines and this further worsens sentiment and further discourages consumption and investment. Banks become less willing to lend and stock markets fall. The falling stock markets discourage people from buying shares and so share prices fall further. The despondency becomes irrational and greatly exaggerates economic fundamentals.

This same irrationality applies in a boom. Here it becomes irrational exuberance. A boom encourages confidence and stimulates consumer spending and investment. This further stimulates the boom via the multiplier and accelerator and further inspires confidence. Banks are more willing to lend, which further feeds the expansion. Stock markets soar and destabilising speculation further pushes up share prices. There is a stock market bubble.

But bubbles burst. The question is whether the current global stock market boom, with share prices reaching record levels, represents a bubble. One indicator is the price/earnings (PE) ratio of shares. This is the ratio of share prices to earnings per share. Currently the ratio for the US index, S&P 500, is just over 26. This compares with a mean over the past 147 years of 15.64. The current ratio is the third highest after the peaks of the early 2000s and 2008/9.

An alternative measure of the PE ratio is the Shiller PE ratio (see also). This is named after Robert Shiller, who wrote the book Irrational Exuberance. Unlike conventional PE ratios, which only look at average earnings over the past four quarters, the Shiller PE ratio uses average earnings over the past 10 years. “Because this factors in earnings from the previous ten years, it is less prone to wild swings in any one year.”

The current level of the Shiller PE ratio is 29.14, the third highest on record, this time after the period running up to the Wall Street crash of 1929 and the dot-com bubble of the late 1990s. The mean Shiller PE ratio over the past 147 years is 16.72.

So are we in a period of irrational exuberance? And are stock markets experiencing a bubble that sooner or later will burst? The following articles explore these questions.


2 Clear Instances of Irrational Exuberance Seeking Alpha, Jeffrey Himelson (12/2/17)
Promised land of Trumpflation-inspired global stimulus has been slow off the mark South China Morning Post, David Brown (20/2/17)
A stock market crash is a way off, but this boom will turn to bust The Guardian, Larry Elliott (16/2/17)
The “boring” bubble is close to bursting – the Unilever bid proves it MoneyWeek, John Stepek (20/2/17)


  1. Find out what is meant by Minksy’s ‘financial instability hypothesis’ and a ‘Minsky moment’. How might they explain irrational exuberance and the sudden turning point from a boom to a bust?
  2. Is it really irrational to buy shares with a very high PE ratio if everyone else is doing so?
  3. Why are people currently exuberant?
  4. What might cause the current exuberance to end?
  5. How does irrational exuberance affect the size of the multiplier?
  6. How might the behaviour of banks and other financial institutions contribute towards a boom fuelled by irrational exuberance?
  7. Compare the usefulness of a standard PE ratio with the Shiller PE ratio.
  8. Other than high PE ratios, what else might suggest that stock markets are overvalued?
  9. Why might a company’s PE ratio differ from its price/dividends ratio (see)? Which is a better measure of whether or not a share is overvalued?