An excellent learning exercise for students of economics is to take a journal article that uses data to model the economy and then try to replicate the authors’ results. You may well be given an assignment like this in future years of your degree.
One such exercise is used on the University of Massachusetts Amherst’s doctoral programme in economics. Thomas Herndon is a student on that degree and chose to examine a well-known and highly influential paper, Growth in a Time of Debt by Carmen Reinhart then of the University of Maryland and Kenneth Rogoff of Harvard University and former chief economist of the IMF. Professors Reinhart and Rogoff used new data on 44 countries spanning about 200 years.
A key finding of their paper, published in 2010 in the American Economic Review Papers and Proceedings, is that once a country’s government debt exceeds 90% of GDP, growth rates fall considerably: the median across countries by about 1% and the mean considerably more.
The paper has been hugely influential. It has been used to justify the austerity programmes being pursued in many countries, including the UK and the eurozone. Cutting the government deficit to GDP ratio, and ultimately the government debt to GDP ratio, has been seen as a way of achieving higher growth over the longer term, and justifies the adverse effect on short-term growth from the dampening of aggregate demand.
Well, this seemed an interesting paper for Thomas Herndon to examine, and he was keen to show just how Reinhart and Rogoff’s data led to their conclusions. But try as he might, he could not replicate their results. His initial reaction was to think he had made an error, but each time he checked he came back with the same conclusion: they must have made errors in their calculations.
His supervisor at Amherst, Professor Michael Ash, after Thomas had checked and checked again, realised that something was wrong. He encouraged Thomas to write to Reinhart and Rogoff to request sight of their dataset. They duly obliged and it was then that Thomas spotted various errors. These are explained in the articles below, but the overall effect was to alter the conclusion. Although high debt may undermine growth to some extent, the effect is much less than Reinhart and Rogoff concluded, and there are several exceptions to this rule.
On 15 April 2013, Thomas, along with his supervisor, Michael Ash and his colleague, Robert Pollin, published a response to the Reinhart and Rogoff paper. In the abstract to their paper, Does High Public Debt Consistently Stifle Economic Growth? A Critique of Reinhart and Rogoff they state that:
… coding errors, selective exclusion of available data, and unconventional weighting of summary statistics lead to serious errors that inaccurately represent the relationship between public debt and GDP growth among 20 advanced economies in the post-war period. They find that when properly calculated, the average real GDP growth rate for countries carrying a public-debt-to-GDP ratio of over 90 percent is actually 2.2 percent, not –0:1 percent as published in Reinhart and Rogoff. That is, contrary to RR, average GDP growth at public debt/GDP ratios over 90 percent is not dramatically different than when debt/GDP ratios are lower.
The authors also show how the relationship between public debt and GDP growth varies significantly by time period and country. Overall, the evidence we review contradicts Reinhart and Rogoff’s claim to have identified an important stylized fact, that public debt loads greater than 90 percent of GDP consistently reduce GDP growth.
So could this be you in the future? Will you take a famous paper and, by re-examining and reworking the data, find that its conclusions are wrong? Could you end up changing the world? Exciting stuff!
Podcasts
Austerity: A Spreadsheet Error? BBC, More or Less, Tim Harford (20/4/13)
Austerity justification study ‘inaccurate’ BBC Today Programme, Robert Pollin (18/4/13)
Articles
UMass Student Exposes Serious Flaws in Harvard Economists’ Influential Study The Atlantic Wire, J.K. Trotter (18/4/13)
Shocking Paper Claims That Microsoft Excel Coding Error Is Behind The Reinhart-Rogoff Study On Debt Business Insider, Mike Konczal (16/4/13)
How a student took on eminent economists on debt issue – and won Economic Times of India (19/4/13)
Meet the 28-Year-Old Grad Student Who Just Shook the Global Austerity Movement New York Magazine, Kevin Roose (19/4/13)
An economist’s mea culpa: I relied on Reinhart and Rogoff Confessions of a Supply-Side Liberal blog, Miles Kimball (22/4/13)
The Rogoff-Reinhart data scandal reminds us economists aren’t gods The Guardian, Heidi Moore (18/4/13)
Reinhart, Rogoff… and Herndon: The student who caught out the profs BBC News Magazine, Ruth Alexander (20/4/13)
George Osborne’s case for austerity has just started to wobble The Guardian, Polly Toynbee (18/4/13)
The error that could subvert George Osborne’s austerity programme The Guardian, Charles Arthur and Phillip Inman (18/4/13)
The Excel depression Sydney Morning Herald, Paul Krugman (19/4/13)
Europe: Retreat from austerity BBC News, Gavin Hewitt (23/4/13)
Guest post by Thomas Herndon
The Grad Student Who Took Down Reinhart And Rogoff Explains Why They’re Fundamentally Wrong Business Insider, Thomas Herndon (22/4/13)
Papers
Growth in a Time of Debt NBER working paper, Carmen M. Reinhart and Kenneth S. Rogoff (January 2010)
Does High Public Debt Consistently Stifle Economic Growth? A Critique of Reinhart and Rogo ff PERI Working Paper 322, Thomas Herndon, Michael Ash and Robert Pollin (April 2013)
Questions
- What were the particular errors made by Reinhart and Rogoff?
- How has their paper been used as a basis for the design of macroeconomic policy?
- What are the limitations of using even accurate time-series data as the basis for policy measures?
- How might the work of Herndon change the direction of future macroeconomic policy?
- In his guest post in Business Insider (see link above), Herndon wrote: ‘The implication for policy is that, under particular circumstances, public debt can play a key role in overcoming a recession.’ What might this role be?
- Why might we have to be cautious in drawing policy conclusions from Herndon’s work?
VAT was introduced on the 1st of April 1973, as part of the conditions for the UK entering the Common Market. Designed by a French tax expert, Maurice Lauré, it was initially envisaged as a straightforward replacement for purchase tax, which would be applied to most goods and services.
Forty years on, VAT is increasingly complex, with numerous exemptions, many anomalies in its scope, and increasingly expensive challenges to its imposition. How did we get to this point? And is it time for VAT to undergo a mid-life makeover?
All governments have to raise taxes – to redistribute income and to fund public spending. They have a number of mechanisms they can use, but essentially they have to tax incomes (direct taxes), spending (indirect taxes) or a mix of both. The main indirect tax in the UK is VAT, which now raises over £100bn a year, compared with £1.5bn in its first year (see above chart: click here for a PowerPoint version). Initially envisaged as a simple, cross-Europe purchase tax, the current system is complex and at times appears to have been formulated ‘on the hoof’, never a good way to build a tax system.
In the 2012 Budget, the Chancellor decided to apply the standard rate of income tax to hot takeaway pasties; previously they had been zero-rated. However, he had sharply underestimated the ability of the industry to lobby against the tax, working closely with the tabloid press. Perhaps more importantly, he also missed the complex nature of the good; when is a hot pasty just cooling down? And what is hot? The government backtracked and now 20% VAT is only charged on pasties that are deliberately kept hot. You might think that this change of heart avoided introducing an anomaly, but consider how you might feel if you sell takeaway baked potatoes, which are subject to VAT.
Apart from the complexity of the system, VAT is unpopular with some commentators who feel that it falls too heavily on low-income households. Although many foodstuffs are zero-rated and housing is exempt, VAT is charged at 20% on clothing and many necessities such as cleaning materials. Gas and electricity are subject to a reduced rate of 5% and both alcohol and cigarettes have additonal excise duties imposed and yet are disproportionally consumed by the poor. When the standard rate of VAT was temporarily dropped to 15% in 2010, but then permanently raised to 20% in 2011, many felt that this was a shift in the tax burden to the poor.
So complex, irrational and prone to changes following political lobbying or expensive legal cases, VAT does seem to be stumbling into its forties under something of a cloud. However, it remains the case that it raises a large proportion of UK tax revenues at relatively low direct cost and provides the Chancellor with a reasonably effective fiscal policy tool. Even if a government wanted to put in place an alternative, it is likely that the associated political risks would be too high for it to do so. We might hope for some rationalisation of the current system, but there is little doubt that we will be raising a glass to VAT’s 50th birthday in 2023.
The links below include some articles on VAT’s 40th birthday and some more general articles on VAT.
Articles
VAT is 40 years old- and now has middle-age spread The Guardian, Juliette Garside (31/1/13)
Is VAT suffering a mid-life crisis at 40? BBC News, Colin Corder (31/3/13)
VAT at 40, not simple, not popular, but central to government revenue-raising The Chartered Institute of Taxation (28/3/13)
Happy birthday VAT, here’s how not to pay you The Telegraph, Rosie Murray-West (31/3/13)
Poorest spend higher proportion of VAT than richest BBC News (31/10/11)
A Value- Added Tax offers much to love- and hate New York Times, Gregory Mankiw (1/5/10)
EC Standard VAT Declaration European Commission Roadmap (2012)
Data and information
VAT pages HMRC
Public sector finance statistics HM Treasury (follow link to latest Public finances databank (Excel file) and go to Worksheet C2)
Latest European Union EU VAT rates VATLive
Questions
- Explain why VAT might be deemed regressive. Can you formulate an argument that it falls more heavily on the rich than the poor?
- Why is VAT administratively cheap? Other than generating tax revenues, can you think of any advantages of the tax?
- Newspapers and books are zero-rated in the UK, while e-books and news apps are standard rated at 20%. Can you identify some other anomalies in the UK VAT system? Is there an argument that a better approach would be to charge a lower rate on all goods and services?
- Who pays VAT, consumers or producers? Illustrate your answer with a diagram, or two.
- A business has to register for VAT once it has a turnover of £77,000 pa. Does this system give rise to any perverse incentives?
- Countries across the European Union have varying VAT rates, applied to very different ranges of products. Explain why this might hinder the workings of a single European market.
- Imagine you were running a brand new economy; would you use a value-added tax to raise revenues? What are the alternatives open to governments?
The UK economy is suffering from a lack of aggregate demand. Low spending in real terms is preventing the economy from growing. A simple solution would seem to be to stimulate aggregate demand through fiscal policy, backed up by even looser monetary policy. But this is easier said than done and could result in undesirable consequences in the medium term.
If increased borrowing were to be used to fund increased government expenditure and/or cuts in taxes, would any resulting growth be sufficient in the medium term to reduce the public-sector deficit below the initial level through automatic fiscal stabilisers? And would the growth be sustainable? The answer to this second question depends on what happens to the supply side of the economy. Would there be an increase in aggregate supply to match the increase in aggregate demand?
This second question has led many economists to argue that we need to see a rebalancing of the economy. What is needed is an increase in investment and exports, rather than an increase in just consumer expenditure funded by private borrowing and government current expenditure funded by public borrowing.
But how will exports and investment be stimulated? As far as exports are concerned, it was hoped that the depreciation of the pound since 2008 would give UK exporters a competitive advantage. Also domestic producers would gain a competitive advantage in the UK from imports becoming more expensive. But the current account deficit has actually deteriorated. According to the EU’s AMECO database, in 2008 the current account deficit was 1% of GDP; in 2012 it was 3.7%. It would seem that UK producers are not taking sufficient advantage of the pound’s depreciation, whether for exports or import substitutes.
As far as investment is concerned, there are two major problems. The first is the ability to invest. This depends on financing and things such as available land and planning regulations. The second is the confidence to invest. With not little or no growth in consumer demand, there is little opportunity for the accelerator to work. And with forecasts of sluggish growth and austerity measures continuing for some years, there is little confidence in a resurgence in consumer demand in the future. (Click here for a PowerPoint of the above chart. Note that the 2013 plots are based on AMECO forecasts.)
So hope of a rebalancing is faint at the current time. Hence the arguments for an increase in government capital expenditure that we looked at in the last blog post (The political dynamite of calm economic reflection). The problem and the options for government are considered in the following articles.
Articles
Budget 2013: Chancellor’s rebalancing act BBC News, Stephanie Flanders (11/3/13)
Why George Osborne is failing to rebalance the economy The Guardian, Larry Elliott (17/3/13)
Economy fails to ‘rebalance’ Financial Times, Sarah O’Connor (27/2/13)
Analysis – Long haul ahead for Britain’s struggling economy Reuters, William Schomberg (3/3/13)
Can banks be forced to lend more? BBC News, Robert Peston (12/3/13)
Budget 2013: What the commentators are saying BBC News (13/3/13)
Data
UK Trade, January 2013 (ONS) (12/3/13)
Business investment, Q4 2012 ONS (27/2/13)
Questions
- Draw a diagram to illustrate the effects of a successful policy to increase both aggregate demand and aggregate supply. What will determine the effect on the output gap?
- For what reasons has the UK’s current account deteriorated over the past few years while those of the USA and the eurozone have not?
- Using ONS data, find out what has happened to the UK’s balance of trade in (a) goods and (b) services over the past few years and explain your findings.
- Why are firms reluctant to invest at the moment? What policy measures could the government adopt to increase investment?
- With interest rates so low, why don’t consumers borrow and spend more, thereby aiding the recovery?
In a carefully argued article in the New Statesman, the UK Business Secretary, Vince Cable, considers the slow recovery in the economy and whether additional measures should be adopted. He sums up the current state of the economy as follows:
The British economy is still operating at levels around or below those before the 2008 financial crisis and roughly 15 per cent below an albeit unsustainable pre-crisis trend. There was next to no growth during 2012 and the prospect for 2013 is of very modest recovery.
Unsurprisingly there is vigorous debate as to what has gone wrong. And also what has gone right; unemployment has fallen as a result of a million (net) new jobs in the private sector and there is vigorous growth of new enterprises. Optimistic official growth forecasts and prophets of mass unemployment have both been confounded.
He argues that supply-side policies involving “a major and sustained commitment to skills, innovation and infrastructure investment” are essential if more rapid long-term growth is to be achieved. This is relatively uncontroversial.
But he also considers the claim that austerity has kept the economy from recovering and whether policies to tackle the negative output gap should be adopted, even if this means a short-term increase in government borrowing.
But crude Keynesian policies of expanding aggregate demand are both difficult to implement and may not take into account the particular circumstance of the current extended recession – or depression – in the UK and in many eurozone countries. World aggregate demand, however, is not deficient. In fact it is expanding quite rapidly, and with the sterling exchange rate index some 20% lower than before the financial crisis, this should give plenty of opportunity for UK exporters.
Yet expanding UK aggregate demand is proving difficult to achieve. Consumers, worried about falling real wages and large debts accumulated in the years of expansion, are reluctant to increase consumption and take on more debts, despite low interest rates. In the light of dampened consumer demand, firms are reluctant to invest. This makes monetary policy particularly ineffective, especially when banks have become more risk averse and wish to hold higher reserves, and indeed are under pressure to do so.
So what can be done? He argues that there is “some scope for more demand to boost output, particularly if the stimulus is targeted on supply bottlenecks such as infrastructure and skills.” In other words, he advocates policies that will simultaneously increase both aggregate demand and aggregate supply. Monetary policy, involving negative real interest rates and quantitative easing, has helped to prevent a larger fall in real aggregate demand and a deeper dive into recession, but the dampened demand for money and the desire by banks to build their reserves has meant a massive fall in the money multiplier. Perhaps monetary policy needs to be more aggressive still (see the blog post, Doves from above), but this may not be sufficient.
Which brings Dr Cable to the political dynamite! He advocates an increase in public investment on infrastructure (schools and colleges, hospitals, road and rail projects and housing, and considers whether this should be financed, not by switching government expenditure away from current spending, but by borrowing more.
Such a strategy does not undermine the central objective of reducing the structural deficit, and may assist it by reviving growth. It may complicate the secondary objective of reducing government debt relative to GDP because it entails more state borrowing; but in a weak economy, more public investment increases the numerator and the denominator.
He raises the question of whether the balance of risks has changed: away from the risk of increased short-term borrowing causing a collapse of confidence to the risk of lack of growth causing a deterioration in public finances and this causing a fall in confidence. As we saw in the blog post Moody Blues, the lack of growth has already caused one ratings agency (Moody’s) to downgrade the UK’s credit rating. The other two major agencies, Standard & Poor’s and Fitch may well follow suit.
The day after Dr Cable’s article was published, David Cameron gave a speech saying that the government would stick to its plan of deficit reduction. Not surprisingly commentators interpreted this as a split in the Coalition. Carefully argued economics from Dr Cable it might have been, but political analysts have seen it as a hand grenade, as you will see from some of the articles below.
When the facts change, should I change my mind? New Statesman, Vince Cable (6/3/13)
Keynes would be on our side New Statesman, Vince Cable (12/1/11)
Exclusive: Vince Cable calls on Osborne to change direction New Statesman, George Eaton (67/3/13)
Vince Cable: Borrowing may not be as bad as slow growth BBC News (7/3/13)
Vince Cable makes direct challenge to Cameron over economic programme The Guardian, Nicholas Watt (7/3/13)
Vince Cable Says George Osborne Must Change Course And Borrow More To Revive Growth Huffington Post, Ned Simons (6/3/13)
David Cameron and Vince Cable at war over route to recovery Independent, Andrew Grice (6/3/13)
Vince Cable: Borrowing may not be as bad as slow growth BBC News, James Landale (6/3/13)
David Cameron: We will hold firm on economy BBC News (7/3/13)
David Cameron: We will hold firm on economy BBC News (7/3/13)
Clegg Backs Cable Over Controversial Economy Comments LBC Radio, Nick Clegg (7/3/13)
It’s plain what George Osborne needs to do – so just get on and do it The Telegraph, Jeremy Warner (6/3/13)
Vince Cable’s plan B: a “matter of judgement” BBC News, Stephanie Flanders (7/3/13)
George Osborne needs to turn on the spending taps The Guardian, Phillip Inman (12/3/13)
Questions
- Why has monetary policy proved ineffective in achieving a rapid recovery from recession?
- Distinguish between discretionary fiscal policy and automatic fiscal stabilisers.
- Why has the existence of automatic fiscal stabilisers meant that the public-sector deficit has been difficult to bring down?
- In what ways has the balance of risks in using discretionary fiscal policy changed over the past three years?
- In what ways is the depression of the late 2000s/early 2010s (a) similar to and (b) different from the Great Depression of the early 1930s?
- In what ways is the structure of public-sector debt in the UK different from that in many countries in the eurozone? Why does this give the government more scope for expansionary fiscal policy?
- Why does the Office of Budget Responsibility’s estimates of the tax and government expenditure multipliers suggest that “if fiscal policy is to work in a Keynesian manner, it needs to be targeted carefully, concentrating on capital projects”?
- Why did Keynes argue that monetary policy is ineffective at the zero bound (to use Dr Cable’s terminology)? Are we currently at the zero bound? If so what can be done?
- Has fiscal tightening more than offset loose monetary policy?
According to the first estimate by the Office for National Statistics, the UK economy shrank by 0.3% in the final three months of 2012. This means that over the whole year growth was flat.
The biggest contributor to the fall in GDP in Q4 was the production industries, which include manufacturing. Output of the production sector fell by 1.8% in Q4. Construction sector output, by contrast, was estimated to have increased by 0.3%. Service sector output was flat. The chart below shows quarterly and annual growth in the UK from 2007 to 2012. (Click here for a PowerPoint.)
Latest estimates by the IMF are that the UK economy will grow by 1.0% in 2013 – well below the long-term growth in potential output (see also the last blog, High hopes in the Alps). But some forecasters are predicting that real GDP will continue to fall for at least one more quarter, which means that the economy would then be in a ‘triple-dip recession’.
Not surprisingly politicians have interpreted the statistics very differently, as have economists. The government, while recognising that the UK faces a ‘very difficult economic situation’, argues that now is not the time to change course and that by continuing with policies to reduce the deficit the economy will be placed on a firmer footing for sustained long-term growth
The opposition claims that the latest figures prove that the government’s policies are not working and that continuing attempts to bear down on the deficit are depressing aggregate demand and thereby keeping the economy depressed.
The following webcasts, podcasts and articles expand on these arguments. Try to be dispassionate in using economic analysis and evidence to assess the arguments.
Webcasts and podcasts
Video Summary: Gross Domestic Product Preliminary Estimate, Q4 2012 Media Briefing (Click here for the following Q&A) ONS (25/1/13)
Triple dip on the menu? Channel 4 News, Siobhan Kennedy and Faisal Islam (25/1/13)
Getting and spending – the key to recovery Channel 4 News, Cathy Newman (25/1/13)
UK economy shrinks by 0.3% in the last three months of 2012 BBC News, Hugh Pym (25/1/13)
Danny Alexander on GDP figures and economic plans BBC Daily Politics (25/1/13)
Osborne defends government’s deficit reduction plan BBC News (25/1/13)
Ed Balls: UK economy urgently needs a ‘Plan B’ BBC News (25/1/13)
UK heads for triple dip as GDP contracts 0.3pc The Telegraph, Philip Aldrick (25/1/13)
Economist: Government may need to rethink its fiscal policy The Telegraph, Jim O’Neill (25/1/13)
Has austerity really been tried in Britain? BBC Today Programme, Jonathan Portes and Andrew Lilico (29/1/13)
Articles
UK GDP: Economy shrank at end of 2012 BBC News (25/1/13)
UK GDP shrinks by 0.3% in fourth quarter: what the economists say The Guardian (25/1/13)
New Bank of England head Mark Carney hints at big shift in policy The Guardian (26/1/13)
The Bank of England, the chancellor, and the target BBC News. Stephanie Flanders (29/1/13)
The Entire World Of Economics Is Secretly Thankful To The UK Right Now Business Insider, Joe Weisenthal (26/1/13)
Data
Gross Domestic Product: Preliminary Estimate, Q4 2012 ONS (25/1/13)
Video Summary: Gross Domestic Product Preliminary Estimate, Q4 2012 ONS (25/1/13)
Preliminary Estimate of GDP – Time Series Dataset 2012 Q4 ONS (25/1/13)
Business and Consumer Surveys DG ECFIN
Questions
- What are the reasons for the decline in GDP in 2012 Q4??
- Examine how likely it is that the UK will experience a triple-dip recession.
- What measures could be adopted to increase consumer and business confidence?
- If there is substantial spare capacity, is expansionary fiscal policy the best means of achieving economic growth?
- What additional monetary policy measures could be adopted to stimulate economic growth?
- Find out what has happened to the UK’s public-sector deficit and debt over the past three years. Explain what has happened.
