Why was economics so insular?

Noah Smith has a good piece on what seems like the never ending stream of popular articles in the UK slagging off economics (or economists). Here I outlined three potential reasons for this epidemic: people do not understand unconditional macro forecasts, politicians from the right do not like economists spoiling their pet schemes (e.g. Brexit), and many heterodox economists from the left wage endless war against the mainstream. All these complaints get airtime when the economy is bad.

The UK economy, right now, is perhaps in a worse state than at any time in the last eighty years. As John Lewis shows in this Bank blog, productivity growth has perhaps never been as bad as it is now: we have to go back to before 1800 to find anything comparable.

The natural reaction when the economy is bad is to criticise economists. That was what happened after the Global Financial Crisis, with some justification. But what is happening in the UK right now is mainly a result of first austerity and then Brexit. As I explained in detail in my earlier post, if we had followed the advice of mainstream economics austerity and Brexit would not have happened. [1] I have as yet not read a single critique of economics that has pointed that fact out, which if you think about it is extraordinary.

There is a little more to say about why economics is an easy target. Historically it has been very insular, and in this respect quite unlike other social sciences. I have already discussed the paper by Haldane and Turrell in the OXREP Rebuilding Macroeconomic Theory volume on Agent Based Models, but I did not have space to show an interesting chart from the introduction to that paper.

It tracks citations in papers to those in other disciplines. Until around 2000, there was no doubt which was the most insular discipline: economics. This is no surprise to me and I suspect most social scientists.

The paper does not explore the reasons why economics is so self-referential: their aim is simply to suggest that it needs to look to other disciplines to see what methods they use. Here I want to sketch why I think mainstream economics (and here the qualification mainstream is required) is so insular.

I once gave a lecture course on the methodology of economics, and in one lecture I used a large blackboard to describe how nearly all economics can be derived from the basic axioms of rational choice. For example the modern macroeconomics of consumption is just the choice between buying apples or pears transformed to the choice between consumption at different times. In that sense economic theory is like an immense tree, where every branch deductively builds on this core. Sometimes large branches grow by adding new elements, like asymmetric information, which then becomes part of the tree and can be used by other branches. This deductive tree of economic theory did not grow all by itself: its growth was and is influenced by the real world problems it wanted to address.

In using the idea of explaining decisions by optimising welfare under constraints economists have created a whole series of widely applicable tools. Economists naturally think about opportunity costs, adverse selection, moral hazard, incentives etc. There is something distinctive about thinking like an economist. To say, as Tom Clark does here, that sometimes this is just formalising common knowledge may be true (see also Cahal Moran here), but in many cases it is not. Try persuading someone who has invested in what is now a sub-optimal project about sunk costs.

This body of theory includes the neoclassical economics that heterodox economists and others love to hate, but it also includes game theory that has applications well beyond economics, and more. In my first year of studying economics I was told in some lectures that this whole endeavour was a huge ideologically driven misstep, but I began to see it differently after reading this famous 1963 paper by Arrow. It shows why (asymmetric) uncertainty in the health service means that the standard competitive model just cannot work for medical care. That may be obvious to us in the UK but it appears otherwise to many in the US. To be fair Clark also acknowledges that this economic theory has produced positive successes: he mentions auction theory but there are many more.

As to ideology, if you want an effective critique of neoliberalism you have to use economics (see, for example Colin Crouch’s book on neoliberalism or this by Dani Rodrik). So many critiques of economics use a kind of bastardised version that insists that workers are always paid their marginal products that the political right also employs. But monopoly and monopsony power are also part of the deductive tree. A paper I like to refer to in this context is by Piketty, Saez and Stantcheva (discussed here) which uses a simple bargaining model to show how cutting the top rate of tax can increase pre-tax CEO pay.

There is nothing like this deductive tree in other social sciences, and I think it at least partly explains why economics used to be so insular. As non-economists academics seemed to add little to building on this theory, there seemed little point in collaborating or even citing them. But, from the point of view of other disciplines, it was worse than that. Economics could also be imperialistic. Its methods, both theoretical and empirical, could be applied to other fields (with varying degrees of success): here is David Hendry applying his econometric methods to climate change, for example. So not only did economists not talk much to other social sciences, they trod on toes as well.

But although there may still be important branches to be added [2], the limitations of what you can do with a few axioms about rational choice have led in recent years to economics becoming much more empirical, and much less tied to this deductive theory. (See the article by Noah Smith which began this post. Unfortunately in my view an exception to this trend so far is macroeconomics.). We can see this in the citations data above, and the most obvious manifestation is behavioural economics. But a more immediate example of a data rather than theory based idea is the gravity model in international trade, which lies at the heart of why Brexit is such a bad idea. It is irony indeed that just at the point at which we have all these articles attacking economics, a large number of people who believe the UK is committing a large act of self harm are seeing the virtue of just one small part of what economists do.

Having said all this, I think there is an unfortunate hangover from this insularity. As a discipline economics shows little interest in communicating its core knowledge to others [3]. This can be true both within academia and with the outside world. Within academia publishing in top economics journals still has far higher status than top journals in other disciplines. When it comes to policy and the public, there is a belief among many that when either requires our wisdom, they will seek out the best of us for advice. In part this epidemic of articles about the failings of economics reflects this communication failure. More importantly, both Brexit and Trump should be a wake up call that economists as a collective has to get better at communicating the core insights of economics.

[1] There are of course more underlying problems behind the UK productivity crisis beyond the negative shocks of austerity and Brexit. But economists overwhelmingly argue for more R&D spending and more public investment. In short if you want someone to blame for why the UK economy is currently in such a dire state, blame those who have ignored the advice of economists.

[2] Most of the good criticisms that I see of economics amount to requests to add to the tree. But economics is so rich that most things are possible. In part (but only in part) what is done follows the money: you will find it relatively easy to get money for work on free trade compared to work on rent seeking. To blame economists for that is just bad economics. As economists found out after the financial crisis, they had many tools to understand what had happened, but had just not applied them before the crisis.   

[3] I say as a discipline because I mean economists as a collective, not as individuals. There is no equivalent institutional infrastructure in economics to that built by the hard sciences. Of course many individual economists do their best, but there are also others who ignore the consensus to plug their own personal ideas or to further some political or ideological cause.

Austerity is an integral part of the Greek tragedy

Too many people, including many in the Troika, see the Greek struggle as just about transfers from one debtor nation to lots of creditor nations. That is why they perhaps saw the Greek referendum as an unhelpful move, as just inflaming nationalist sentiment. As Dani Rodrik puts it “What the Greeks call democracy comes across in many other – equally democratic – countries as irresponsible unilateralism.”

It is, however, not just about transfers, or what economists call a zero sum game. It is also fundamentally about austerity, as Dani Rodrik, Thomas Picketty, Heiner Flassbeck, Jeffrey Sachs and I say in this letter jointly published in the Guardian, Le Monde, The Nation and Der Tagesspiegel (and thanks to Avaaz for making this happen).

I think many people believe that a debtor country must somehow inevitably suffer large scale unemployment as a result of having to pay back at least some of its debts. But this comes more from a moralistic view than thinking about the macroeconomics. In an open economy, the real exchange rate (competitiveness) will adjust to ensure ‘full employment’ is preserved, whatever primary surplus (taxes less non-interest spending) a government needs to service and pay back its debt.

Under flexible exchange rates this competitiveness adjustment could happen immediately. Things are not quite so simple in a monetary union: competitiveness cannot immediately adjust because of wage and price rigidities. A period of ‘excess unemployment’ will be required to push wages and prices down if the country is uncompetitive in relation to required primary surpluses. However the excess unemployment can be relatively modest. In fact, because of the structure of the standard Phillips curve, it is much more efficient to achieve gains in competitiveness gradually through a measured increase in unemployment than quickly through a rapid rise in unemployment, for reasons I outlined here when talking about Latvia.

To achieve this efficient outcome may well require the government to reduce its primary deficits gradually, because without this fiscal support while competitiveness adjusts output could fall rapidly. This in turn will require more government borrowing, and if the government cannot do this from the markets, the IMF or other governments should step in to ensure this efficient adjustment can take place and avoid the waste and suffering of unnecessary unemployment.

This is what failed to happen in the case of Greece. Whether this was just the result of poor Troika calculations, or a consequence of feeling that creditor bankers were more of a priority (see, for example, Mark Blyth), need not concern us here. Once the mistake became clear, perhaps creditor voter fatigue meant additional loans were not politically possible. But to demand primary surpluses (i.e. to take money out of the country) while unemployment remains so high - as the Troika continues to do - is unforgivable in my view. It clearly makes the unemployment problem worse - see here, footnote [2]. At best it indicates an impatient creditor with no concern for the welfare of the debtor, but given the responsibility the creditor has for the debtor’s current position it is far worse than that.

That is not the only reason Greece’s story is about austerity. Its problems were made worse by the austerity across the Eurozone as a whole, and the deflation which that has brought. Deflation increases the real value of nominal debts. It also makes competitiveness adjustment more difficult because of a well known non-linearity.

Even those that have a great dislike or distrust of Syriza should recognise that Syriza is also a product of acute austerity, a point which the referendum reaffirmed. As economists might say, Syriza is endogenous.

That the Greek economy now lies broken is not the inevitable result of imprudent borrowing a decade ago, or structural weaknesses, or a left wing government elected just a few months ago. It is also the result of the actions of those who effectively ran the economy from 2010 to 2014, and their imposition of draconian austerity. Greece long ago recognised the folly of its borrowing, and has made a start on addressing its structural weaknesses. The Troika has yet to acknowledge its own part in making this tragedy.

What is it about Latvia?

                that either makes visitors lose their critical faculties, or non-visitors like myself and Paul Krugman lose theirs. In my earlier post, I was not that surprised that a member of the ECB’s Executive Board would trumpet Latvia’s ‘success story’, because that fitted the party line. I was a little more surprised to find the head of the IMF saying similar things, because the IMF has been rather more realistic about the consequences of austerity and internal devaluation. (Although the contrast between the IMF’s recent UK assessment in writing, and what Lagarde said in public, was widely noted at the time). What really surprised me was this post from Dani Rodrik, who has also just visited Latvia.

                Dani Rodrick’s post goes into more detail about recent Latvian macroeconomics. In particular, he suggests that despite the massive decline in GDP and huge rise in unemployment, the economy may still have not completely regained the competitiveness they lost in the preceding boom. So, in terms of the evidence, he sees what I see if not worse. But then he says this.

“The main lesson I take from all this is the need to avoid easy generalizations that do not respect country peculiarities. Fiscal austerity missionaries are surely off base when they say Latvia’s experience decisively proves Keynesians and advocates of currency depreciation wrong.  It is too early to judge the Latvian experience a success.  But it is also too early to say Latvia has been a failure.  Growth may continue, in which case the country will look better and better.”

                When someone like Dani Rodrik looks at the same facts, but comes to rather different conclusions than me, I get worried that perhaps I’m wrong. It is also wise to heed Brian Ashcroft’s warning, that small countries do have different characteristics to larger countries. With this in mind, let me go through some of my own macroeconomic reasoning carefully.

                Was the depth of the recession inevitable given the preceding boom? Paul Krugman is perhaps a little too dismissive on this point. The economy clearly was overheating in 2007/8, which is why it became uncompetitive. At the very least, inflation had to come back to a reasonable level. In principle this need not require any subsequent deflation if we have a totally credible macroeconomic policy, a suitable devaluation and a completely forward looking Phillips curve, but that is an idealisation. So some recession was probably inevitable, as it has been for many Eurozone countries. But in 2008/9 Latvia suffered the worst loss of output in the world!

                The key issue is not that Latvia had to get inflation down, but that having done that it also needed to regain competitiveness. It is here that the macroeconomics of a short sharp recession with a fixed exchange rate looks so bad. To see why, think of the following little experiment.

                We have an economy, which through overheating has become uncompetitive. It needs to get its prices in Euro terms down by, say, 20%. The government has dealt with the overheating: the output gap is now zero and inflation is at its competitors’ level. But prices are still 20% too high.

                The least cost option is to devalue the currency by 20%. Now it would be foolish to believe that is all you need to do. Restoring competitiveness will boost demand, so to prevent the overheating starting up again you need to undertake deflationary policy of some kind. You may also need some negative output gap because higher import prices will raise price inflation. However you do not need a 20% decline in output.

                But suppose we take the fixed exchange rate as given. Even in this case, a short sharp recession makes no macroeconomic sense. Suppose that, for given inflation expectations, a 1% output gap will reduce inflation by 1%. A short sharp shock of output 20% below potential for a year will give you -20% inflation in that year, so you will have restored competitiveness quickly, but at great cost. Now think about spreading the correction over two years.

                To see how that works, we need to say a bit more about the Phillips curve. As we discovered in the 1970s, inflation today depends not just on the output gap, but also expected inflation. Suppose our Phillips curve is of the modern New Keynesian kind, so this year’s inflation rate depends on next year’s expected inflation, and let’s assume people are pretty rational in forming their expectations. What if we have an output gap next year of -10%. This will mean that inflation next year will also be -10%. But this year we do not need any output gap at all. Inflation will still be -10%, because expected inflation is -10%. So we get our competitiveness adjustment over two years, but at half the cost in terms of lost output.

                Is my assumption about rational expectations critical here? No. Imagine instead that the Phillips curve is of the old fashioned kind, where expectations are naive and backward looking, so current inflation effectively depends on past inflation. In this case we need an output gap of -10% this year, but then nothing next year, and we still get our correction over two years at half the cost. (We have to do something to get inflation back up after two years in this case, but that is not important to the point I’m making.)

                Now this is all very stylised and partial equilibrium, but there is one important message that will survive complications. The Phillips curve tells us that reducing the price level gradually over time is more efficient than doing it quickly. So even if you believe that you have to stick with a fixed exchange rate, a short sharp recession is much less efficient than a more modest but prolonged recession. Thinking about the convexity of the social welfare function reinforces this point.

                As a result, even if output growth this year and next year was over 5% p.a., and the country achieves a sustainable level of competitiveness, I would not call the Latvian experience a success story. The competitiveness correction will have cost the economy a huge amount in wasted resources and unemployment misery, when it could have achieved this correction at a much reduced cost.