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?
Inflation is measured as the percentage increase in the Consumer Prices Index (CPI) over the previous 12 months. The index is constructed from a basket of goods that is supposed to represent the buying habits of an average UK household. This basket is updated each year as tastes change and as technology moves forward. The basket contains approximately 700 items, with 180,000 individual prices collected each month.
As certain goods become more popular and trends change, the ONS have the responsibility of identifying these changes and updating the basket of goods. The CPI then looks at how the weighted average price of this basket of goods changes from one month to the next. As the CPI gives us the main measure of UK inflation, it is essential that the basket of goods used does represent current consumer demands. If the basket of goods used 20 years ago was still in place, we wouldn’t see thing like mobile phones and ipads being included. This is one sector that has seen significant growth in recent years and the basket of goods has been adapted in response. A new addition to the measure is e-books, which have seen a significant growth in popularity.
However, just as new products have been added to the CPI measure, other goods have been removed. In the most recent update, we’ve seen the removal of champagne and Freeview boxes from the basket of goods. With rapid changes in technological products, such as the ipad, kindle and e-books, products that were new additions only a few years ago are now old news, being replaced by the latest gadgets. Other changes to the basket of goods are less about reflecting consumer trends and more about making certain categories more representative, such as fruits and hot drinks.
So, can the changes in the basket of goods tell us anything about the impact of the recession on buying habits? One notable exclusion from the basket of goods is champagne sold in restaurants and bars. In an economic downturn, you’d expect luxury products to see a decline in consumption and the trend in champagne consumption certainly seems to support the theory. The trends suggest that consumers have instead switched to cheaper alternatives, with things like white rum bought from shops increasing.
Many people may look at the basket of goods and think that it doesn’t reflect what you buy in your average shop. But, the purpose of the CPI is to try to reflect the average consumer and the different items in the basket are given different weightings to give some indication of the amount spent on each good. The articles below look at the changes in the CPI basket of goods and what, if anything, we can take from it.
Inflation basket: E-books added by ONS BBC News (12/3/13)
Inflation basket – what does it say about you? Channel 4 News (12/3/13)
The fizz has fallen flat – champagne cut from inflation basket Independent, Martin Hickman (13/3/13)
E-books added to inflation basket, as champagne dropped The Telegraph, Philip Aldrick (13/3/13)
UK inflation basket: e-books in, champagne out The Guardian, Marking King (13/3/13)
Champagne tipped out of inflation basket Financial Times, Hannah Kuchler (13/3/13)
Champagne out, ebooks in as inflation basket updated Reuters (13/3/13)
Questions
- What is inflation and why is it such an important variable?
- How is the CPI calculated? Is it different from the RPI?
- What impact has technological change had on the basket of goods used to calculate the CPI?
- Can you identify any other economic or business trends from the products that are in and out of the CPI basket of goods?
- Given the importance of technology and the speed of change, do you think the review of the basket of goods should become more or less frequent?
- Has the economic downturn had any effect on the basket of goods used to calculate the CPI?
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?
Adverts are increasingly diverse, ranging from families using various products and promoting their qualities, to a gorilla drumming, a horse dancing and a monkey drinking tea! But, how important is advertising to a product’s brand. Does it have a positive effect on sales and profitability?
The key role of advertising is to sell more products and many firms spend a huge amount on advertising campaigns. Indeed, over £16bn was spent on advertising in 2012. Given that the economy is still vulnerable and many firms have seen their sales and profits decline, this is a huge amount. Procter & Gamble spent over £200 million, British Sky Broadcasting spent £145 million and Tesco spent £114 million in 2011.
Advertising increases consumer awareness of the product and its features, but also actively aims to persuade people to purchase the product. By differentiating the product through adverts a company aims to shift the demand curve to the right and also make it more inelastic, by persuading customers that there are no (or few) close substitutes.
Since the start of the economic downturn in 2008, advertising expenditure has fallen, as companies have seen a decline in their budgets. From a high of £18.61 billion in 2004, the Advertising Association found that it fell to £14.20 billion in 2009 at constant 2008 prices. In the last few years, advertising expenditure has remained at around £14.5 billion. But, is cutting back on advertising a sensible strategy during a recession? Of course budgets are tight for both firms and consumers, but many suggest that media-savvy firms would actually benefit from maintaining their advertising. By doing so firms could take advantage of weaker competitors by increasing their market share and establishing their brand image in the long run.
It’s also important to consider another link between economic growth and advertising. Research suggests that advertising can be an important factor for economic growth. A three-year study undertaken by the Advertising Association and Deloitte, commencing in January 2013 suggests that for every £1 spent on advertising in the UK, £6 is generated for the wider economy. Based on these predictions, the estimated £16bn that was spent on ad campaigns in 2011 added over £100 billion to the UK’s GDP.
So, perhaps encouraging more advertising is the answer to the UK’s economic dilemma. This is certainly the opinion of Matt Barwell, the consumer marketing and innovation director of Diageo Western Europe, who said:
People fundamentally believe in advertising but a lot of the conversation focuses on negative elements. People rarely get the opportunity to talk about the positive role advertising plays in terms of wealth creation, exports and the social benefits that it provides. These are all things that many of us take for granted.
If private firms can therefore be encouraged to boost their marketing campaigns, jobs may be created, demand for products will rise and with the help of the multiplier, the economy may strengthen. Advertising has both pros and cons and opinions differ on what makes a good advert. But, whatever your opinion of the role of advertising, it is certainly an important aspect of any economy. The following articles take a view of advertising.
Articles
Could we advertise ourselves out of recession? Marketing Week, Lucy Tesseras (31/1/13)
Advertising in times of recession: A question of value The Open University, Tom Farrell (13/3/09)
Recession spending on advertising and R&D Penn State, Smeal College of Business
Nothing to shout about The Economist (30/7/09)
UK’s payday lenders face restrictions on advertising Reuters (6/3/13)
Value claims improve advertising effectiveness in recessionary times Com Score, Diane Wilson (17/9/13)
Advertising in a bad economy About Advertising, Apryl Duncan
Advertising worth £100bn to UK economy The Telegraph, Graham Ruddick (31/1/13)
Can advertising be the motor that gets the struggling UK economy out of first gear? More about advertising (26/2/13)
Adverts ‘worth £100bn to UK’ Independent, Giddeon Spanier (30/1/13)
Report
Advertising Pays – How advertising fuels the UK economy Advertising Association & Deloitte (30/1/13)
Advertising Pays – How advertising fuels the UK economy: Accompanying video presentation Advertising Association & Deloitte: on YouTube (30/1/13)
Questions
- What is the role of advertising?
- Using a demand and supply diagram, illustrate and explain the role of advertising.
- During a recession, why would you expect advertising expenditure to fall? What impact would you expect this to have in your diagram from question 1?
- How might firms that sustain their advertising expenditure during a downturn benefit?
- Explain the link between advertising and the economy.
- Why could a higher level of advertising boost economic growth?
- Are there any negative externalities from advertising?
Recent figures from the ONS suggest that the UK lags well behind its competitors in terms of labour productivity. In terms of output per hour worked, Germany produces 22% more than the UK, France produces 26% more, the USA produces 27% more, the Netherlands 31% more and Ireland 43% more. The first chart illustrates some of these figures.
(Click here for a PowerPoint of this chart.)
And in the past few years the problem has been getting worse. This is shown in the second chart. This, however, is a relatively recent phenomenon. Until 2006, the gap was narrowing, but since then it has widened. (Click here for a PowerPoint of the second chart.)
What has caused this widening of the gap? Part of the problem is a historical lack of investment in the UK. Between 2005 and 2012, the UK invested on average 15.7% of GDP. The USA invested 16.5%, Germany 17.9% and France 20.1%. And part of the problem has been the cut back in private-sector investment in response to the recession (which has been deeper in the UK) and in public-sector investment as part of the government’s austerity measures.
Part of the problem has been lower levels of inward investment. Inward direct investment to the UK in 2011 was only 24 per cent of that in 2007. In France, Germany, Italy and the USA, the figures were 43, 50, 66 and 105 per cent respectively.
Part of the problem has been the size of the financial sector in the UK. This is considerably larger as a proportion of the economy than in most the UK’s major competitors. And it was this sector most hard hit by the crisis of 2007/8.
With this poor productivity performance, you might expect unemployment to have soared. In fact, the UK has one of the lowest unemployment rates of the developed countries and in recent months it has been falling while other countries have seen their unemployment rates rise.
In fact, low productivity and high employment are compatible. If people produce less than their counterparts abroad, then more people will be needed to produce the same level of output. The problem, of course, is that this only works if wages are kept down. Indeed, wages have fallen in real terms and now stand at the level of 10 years ago.
The problem of falling real wages is that this translates into a lack of demand – especially when people are trying to reduce their debts. Not only does this result in a lack of economic growth, it discourages firms from investing – and investment is one of the prime drivers of future productivity growth!
The following articles explore the problem of low productivity and its relationship with employment and with both short-term and long-term economic growth.
Articles
UK has widest productivity gap since 1993 City A.M., Ben Southwood (14/2/13)
Productivity ‘key to UK’s economic future’ SnowdropKCS (7/2/13)
Low wages and lack of investment – why UK’s productivity has slumped Wales Online, David Williamson (2/3/13)
Recovery in jobs gives a fillip before the news on growth Independent, Russell Lynch (23/1/13)
U.K. Triple-Dipping as Productivity Falls Slate, Matthew Yglesias (25/1/13)
UK productivity puzzle baffles economists BBC News, By Andrew Walker (18/10/12)
Is low productivity a structural problem in the UK? BBC Today Programme, Bridget Rosewell and Andrew Sentance (4/1/13)
We Need to Talk About the Middle Huffington Post, Stewart Wood (14/2/13)
UK Wages Slump to Lowest Level in a Decade – ONS International Business Times, Shane Croucher (13/2/13)
Britain’s low-wage economy serves as a bind on the country The Guardian, Philip Inman (13/2/13)
Real wages fall back to 2003 levels in UK The Guardian, Hilary Osborne (13/2/13)
Data
International Comparisons of Productivity – Final Estimates for 2011 ONS (13/2/13)
International Comparisons of Productivity, datasets ONS (13/2/13)
Changes in real earnings in the UK and London, 2002 to 2012 ONS (13/2/13)
Questions
- Which is a better measure of productivity – output per worker or output per hour worked? Why, do you think, does the USA produce 39% more per worker, but only 27% more per hour worked?
- What policies should the government adopt in order to encourage a growth in productivity?
- If productivity growth increased, what would be the likely effect on employment? Explain.
- Why has unemployment not risen in recent months?
