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?
Unemployment is a key macroeconomic objective for governments across the world. The unemployment rate for the UK now stands at 7.9% according to the ONS, which recorded 2.56 million people out of work. But why is unemployment of such importance? What are the costs?
The economy is already in a vulnerable state and with unemployment rising by 70,000 people between December and February 2013, the state of the economic recovery has been questioned. Indeed, following the news of the worsening unemployment data, the pound fell significantly against the dollar, suggesting a lack of confidence in the British economy.
Although the increase in the number of people out of work is concerning, perhaps of more concern should be the number of long-term unemployed. The ONS suggests that more than 900,000 have now been out of work for more than a year. Not only does this pose costs for the individual in terms of lost earnings and skills, but it also imposes costs on friends and family and the wider economy. (Click here for a PowerPoint of the first chart, which shows the percentage of unemployed people out for work longer than 12 months.)
The chief executive of the Prince’s Trust focused on the costs of youth unemployment in particular, saying:
Thousands of these young people are long-term unemployed, often facing further challenges such as poverty and homelessness. We must act now to support these young people into work and give them the chance of a better future.
(Click here for a PowerPoint of the second chart, which shows how much higher the unemployment rate is for young people aged 18 to 24 than it is for the working age population as a whole.)
Furthermore, with so many people unemployed, we are operating below full-employment and thus below our potential output. Furthermore, the longer people are out of work, the more likely it is that they will lose their skills and thus require re-training in the future or find that there are now fewer jobs available to them based on their lower skill level.
In addition to this there are monetary costs for the government through lower tax receipts, in terms of income tax, national insurance contributions and even VAT receipts. With more people unemployed, the numbers claiming various unemployment-related benefits will rise, thus imposing a further cost on the government and the taxpayer. Another cost to the government of this latest data is likely to be the expectations of the future course of the economy. Numerous factors affect business confidence and unemployment data is certainly one of them. The concern is that business confidence affects many other variables as well and until we receive more positive data, the economy recovery is likely to remain uncertain. The following articles consider this topic.
UK unemployment rise adds to pressure on Osborne’s austerity strategy The Guardian, Phillip Inman (18/4/13)
Unemployment figures are ‘worrying’, David Cameron’s spokesman says The Telegraph, Peter Dominiczak (17/4/13)
UK unemployment rises to 2.56 million BBC News (17/4/13)
Unemployment jumps to 7.9% as rise in the number of young people out of work takes figure ‘dangerously’ close to a million Mail Online, Leon Watson (17/4/13)
Unemployment up as stay-at-home mothers head back to the job-centre Independent, Ben Chu (17/4/13)
Jobs data points to finely balanced market Financial Times, Brian Groom (18/4/13)
Hugh’s review: making sense of the stats BBC News (19/4/13)
Questions
- How is unemployment measured?
- What are the costs to the individual of being unemployed?
- What are the wider non-monetary costs to society?
- Explain the main financial costs to the wider economy of a rising unemployment rate.
- Illustrate the problem of unemployment by using a production possibility frontier.
- Could there be a negative multiplier effect from a rise in unemployment?
Much has been written on Margaret Thatcher following her death at the age of 87 on April 8. But getting a calm assessment of both her time in office and her legacy is not easy. And it’s clear why: she created both stronger loyalty and stronger opposition than any other UK Prime Minister.
As economists, however, we should try to be as dispassionate as possible in assessing the effects of policies. There is always a normative question of the relative desirability of different economic outcomes – and you will have your own views on the relative importance of objectives such as economic growth, greater equality and greater social cohesion – but to determine cause and effect, or at least correlation, requires a careful examination of the evidence. Also, drawing lessons for future policy requires a careful modelling of the economy and the effects of changing economic variables.
The following articles have been selected from the hundreds that have appeared in the press in the past few days. Whilst they cannot be claimed to be totally ‘objective’, taken together they give a good overview of her economic policies and her economic legacy.
You may well have been surprised by the amount of coverage of her death and at the fervour of her supporters and critics. But this bears witness to the huge effect she had on both the political scene and on the UK economy – for good or bad.
Articles
Margaret Thatcher’s timeline: From Grantham to the House of Lords, via Arthur Scargill and the Falklands War Independent (8/4/13)
Overhauls Are Still Felt, Debated Decades Later Wall Street Journal, Charles Forelle (9/4/13)
Margaret Thatcher’s Four Ages of Monetary Policy EconoMonitor, David Smith (10/4/13)
How Mrs Thatcher smashed the Keynesian consensus The Economist (9/4/13)
Margaret Thatcher: The economy now and then BBC News, Stephanie Flanders (10/4/13)
Did Margaret Thatcher transform Britain’s economy for better or worse? The Guardian, Larry Elliott (8/4/13)
A look back at Margaret Thatcher’s economic record Washington Post, Dylan Matthews (8/4/13)
Margaret Thatcher’s legacy for business and economics—the world weighs in Quartz, Gwynn Guilford (8/4/13)
Data
Economic Data freely available online The Economics Network, see especially sites 1, 2, 3, 6 and 9
Questions
- Summarise the macroeconomic policies followed by the Thatcher government from 1979 to 1990.
- Chart economic growth, unemployment and inflation over Margaret Thatcher’s time in office. How does the performance of each of these indicators compare with the period from 1990 to 2007 and from 2008 to the present day?
- What is meant by ‘monetarism’? Did the Thatcher government follow pure monetarist policies?
- What is meant by the ‘Big Bang’ as applied to the financial sector in 1986? Assess the long-term consequences of the Big Bang.
- What elements of ‘Thatcherism’ were retained by the Labour government from 1997 to 2010?
- To what extent can the current Coalition government be described as ‘Thatcherite’?
In the blog No accounting for trade, the rise in the UK’s balance of trade deficit was discussed. Many factors have contributed to this weakening position and no one market is to blame. But, by analysing one product and thinking about the factors that have caused its export volumes to decline, we can begin to create a picture not just of the UK economy (or more particularly Scotland!), but of the wider global economy.
Scotch whisky may not have been the drink of choice for many British adults, but look outside Great Britain and the volume consumed is quite staggering. For example, French consumers drink more Scotch whisky in one month than they drink cognac in one year. The volume of Scotch whisky exported from our shores was £4.23 billion for 2011, accounting for 90% of all sales and making its way into 200 markets. However, one problem with this product is that it is highly susceptible to the business cycle. Add to this the time required to produce the perfect Scotch (in particular the fact that it must be left to mature) and we have a market where forecasting is a nightmare.
Producers typically look to forecast demand some 10 years ahead and so getting it right is not always easy, especially when the global economy declines following a financial crisis! So what has been the impact on exports of this luxurious drink? In the past few years, it has been as key growth market for UK exports rising by 190% in value over the past decade. But in 2012 the volume of Scotch whisky exports fell by 5% to 1.19 billion bottles. What explains the decline in sales?
The biggest importer of Scotch whisky is France and its volumes were down by 25%. Part of this decline is undoubtedly the economic situation. When incomes decline, demand for normal goods also falls. Many would suggest Scotch whisky is a luxury and thus we would expect to see a relatively large decline following any given fall in income. However, another factor adding to this decline in 2012 is the increased whisky tax imposed by the French government. Rising by 15% in 2012, commentators suggest that this caused imports of Scotch whisky to rise in 2011 to avoid this tax, thus imports in 2012 took a dive. Spain is another key export market and its economic troubles are clearly a crucial factor in explaining their 20% drop in volume of Scotch whisky imported.
But, it’s not all bad news: sales to Western Europe may be down, but Eastern Europe and other growth countries/continents, such as the BRICs and Africa have developed a taste for this iconic product. Latvia and Estonia’s value of Scotch whisky imports were up by 48% and 28% respectively, as Russian demand rises and China, still growing, is another key market. Gavin Hewitt, chief executive of the Scotch Whisky Association said:
A combination of successful trade negotations, excellent marketing by producers, growing demand from mature markets, particularly the USA, and the growing middle class in emerging economies helped exports hit a record £4.3bn last year.
Furthermore, while the volume of exports worldwide did fall, the value of these exports rose to £4.27 billion, a growth of 1%. This suggests that although we are exporting fewer bottles, the bottles that we are exporting are more expensive ones. Clearly some people have not felt the impact of the recession. For Scotland and the wider UK, these declining figures are concerning, but given the cyclical nature of the demand, as the world economy slowly begins to recover, sales are likely to follow suit. Gavin Hewitt continued his comments above, saying:
We are contributing massively to the Government’s wish for an export-led recovery. There is confidence in the future of the industry, illustrated by the £2bn capital investment that Scotch whisky producers have committed over the next three to four years.
The following articles consider the rise and fall of this drink and its role as a key export market across the world.
Scottish whisky industry puts export hope in new market BBC News (2/4/13)
Scotch whisky sales on the slide The Guardian, Simon Neville (2/4/13)
Growth stalls for Scotch whisky exports BBC News (2/4/13)
Scotch whisky accounts for 25pc of UK’s food and drink exports The Telegraph, Auslan Cramb (2/4/13)
Whisky sales fall but value of exports hits new high Herald Scotland (3/4/13)
Scotch whisky exports rise to record value The Telegraph, Auslan Cramb (2/4/13)
Scotch whisky exports hit by falling demand in France The Grocer, Vince Bamford (2/4/13)
New markets save Scotch from impact of austerity Independent, Tom Bawden (2/4/13)
Scotch exports hit by falling demand Financial Times, Hannah Kichler (2/4/13)
Questions
- Which is the better measure of an industry’s performance: the value or the volume of goods sold?
- Why would you expect volumes of Scotch sold to decline during an economic downturn?
- When a higher tax was imposed on Scotch whisky in France, why did volumes fall? Use a demand and supply diagram to illustrate the impact of the tax.
- What type of figure would you expect Scotch whisky to have for income elasticity of demand? Does it vary for different people?
- Why is forecasting demand for Scotch so difficult? What techniques might be used?
- Why does demand for Scotch whisky remain high and even rising in many emerging markets?
- Is the market for Scotch whisky exports a good indication of the interdependence of countries across the world?
House prices have long been an obsession with the UK media and much of the public; when they rise, homeowners feel rich, when they fall, consumer confidence dives. Following the financial crisis and subsequent recession, there has been a great deal of attention focused on the overall health of the housing market.
But the UK faces a particular problem of a sharp and growing divide in regional house prices. First time buyers in London face having to find high deposits and even then, many are unable to access mortgages. Meanwhile those in the regions can access more affordable housing, but may be reluctant to enter the market when prices are stagnant. What are the implications of this divide for the housing market and for the broader economy?
The housing market demonstrates characteristics which are typical of those for goods that are both consumable and involve capital growth; when prices rise housing is seen as a good ‘investment’ and demand increases, this in turn leads to higher prices. Conversely when values drop, demand falls and the market slumps. Markets like this are described as being prone to price bubbles.
Looking at UK house prices as a whole can, however, mask large variations across the economy; variations which can cause problems for jobseekers, for employers and for the government. Recently one of the UK’s largest mortgage lenders predicted continuing regional variance in house prices. Halifax’s figures looked at the price of housing across a number of UK towns and showed that changes seen during 2012 ranged from a 14.8 per cent rise to an 18.4 per cent fall. The biggest rise seen during the year was in Southend on Sea, in Essex, while the greatest fall was in Craigavon, in Northern Ireland. Of the ten towns with the biggest rises, eight were found in London or the south east, with Durham being the only northern town showing growth. Of the ten towns that the Halifax identified with the biggest falls, four are in Scotland, three are in the north west, one is in the north of England and one is in Northern Ireland.
Martin Ellis, housing economist at the Halifax, said:
We expect continuing broad stability in house prices nationally in 2013. The generalised north/south divide in house price performance seen during 2012 is likely to continue next year. House prices are expected to be strongest in London and the south east as this part of the country performs best in economic terms.
These disparities present a particular problem in a recession. While London and the south east show signs of economic growth, with relatively low unemployment and high levels of inward investment, many regions outside London see house prices falling further as unemployment grows. There are some exceptions – the arrival of the BBC in Salford has resulted in a sharp increase in prices there – but, in general, confidence is low outside the south east.
The articles below consider regional differences in the housing market.
Articles
House prices creep up over 2012 The Guardian, Patrick Collinson (29/1/13)
Which regions of the UK will show the biggest house price rises in the next 5 years? This is Money, Rachel Rickard Straus (17/1/13)
Figures reveal scale of regional house price divide Inside Housing, Tom Lloyd (2/1/13)
Property market gets a budget boost, so are things looking up? This is Money, Simon Lambert (21/3/13)
Help to Buy scheme could drive up house prices, says OBR The Guardian, Josephine Moulds and Jennifer Rankin (26/3/13)
London house prices outstrip 2007 peak with a 2.8% increase The Guardian, Hilary Osborne (28/3/13)
Housing market in southeast is worth £2tn Financial Times, James Pickford and Ed Hammond (1/2/13)
House prices show annual increase Evening Standard (28/3/13)
House price data
Links to house price data The Economics Network
Regional Historical House Price Data Halifax House Price Index (Lloyds Banking Group)
Questions
- Thinking about the market for owner-occupied housing, what are the factors that will determine demand? How might these explain variations in demand across different regions of the UK?
- How does the supply of housing vary across the UK?
- What would you predict about regional variations in rents?
- What is the impact of high house prices in London on first time buyers? Does this matter?
- What are the implications for the labour market of sharp variations in house prices across regions?
- Why might the Chancellor want to put in place policies to boost the housing market?
- Who gains from high house prices? Who loses? You might want to think about this in term of the life-cycle.
