Winner of the New Statesman SPERI Prize in Political Economy 2016

Tuesday, 28 February 2012

Why introductory macroeconomics should ditch the LM curve

For teachers and students of economics

                For the next two years I will be taking a break from teaching tutorials in first year undergraduate macro. That will be a relief for just one reason. I have become more and more embarrassed at having to teach the IS-LM model. The IS curve is fine, but the LM curve is not. The reason is obvious enough: central banks do not operate a fixed money supply policy. It would be nice to tell students that the fiction that the monetary authorities fix money is a harmless fairy story, but I do not believe this. Here are just three mistakes or confusions caused by using the LM curve.

1) Is that real or nominal rates on the vertical axis? It does not matter if expected inflation is constant, but we use the apparatus to look at price changes.

2) IS-LM leads to AS/AD. If your goal is controlling inflation, the AS curve suggests that all you need to do is to return to somewhere on the vertical AS curve. If you use a traditional Phillips curve with backward looking expectations then returning to the natural rate will not be enough. Which is the student supposed to believe?

3) IS-LM leads to textbook Mundell Fleming, which in its simplest form has domestic interest rates stuck at world levels. Everyone then learns that fiscal policy is ineffective under floating rates, which is unfortunate, because this is a special consequence of assuming fixed money. The IS curve plus UIP is a much better way to think about this, and gives a more relevant answer: a temporary demand shift is not crowded out by an appreciating real exchange rate if domestic interest rates are unchanged.

                I’m currently lecturing on Oxford’s second year undergraduate macro course. There I largely ignore the LM curve, and (following the textbook by Carlin & Soskice) instead teach a three equation model involving an IS curve, a Phillips curve, and a monetary rule. The monetary rule captures the idea that the monetary authority has preferences over excess inflation and the output gap, and combining this with the IS curve and Phillips curve we can derive a Taylor rule. While the monetary rule curve is far from ideal, representing the result of a static rather than dynamic optimisation exercise, it at least captures the spirit of what central banks try and do today.
The introductory course in macro at Oxford starts with IS-LM, but it also includes the Phillips curve and the Taylor rule, presumably because they are more relevant than the AS curve and the LM curve. So first year students learn about the AS curve and the Phillips curve, the LM curve and a Taylor rule. Perhaps not surprisingly, many get very confused. It would seem to make much more sense to switch things around. Use only the IS curve, Phillips curve and monetary/Taylor rule in a first year introductory course, and only introduce the LM curve in subsequent years. (I would introduce the LM curve in stages. First, think about replacing an inflation target with a price level target for monetary policy. Maybe think about nominal GDP targets, using the current situation as clear motivation. Then go to money supply targets, with of course some discussion of money demand.)
                This sequencing seems clearly preferable, so I find it puzzling that most Principles textbooks do not take this approach, but instead continue to start with IS-LM. Why are they so devoted to the LM curve? Is learning about the LM curve meant to impart some deep wisdom to students? Is there a feeling that because money is important in understanding how business cycles and inflation work, it should be introduced as part of the core model come what may? This seems strange, and is probably counterproductive. Perhaps the explanation is more mundane: that the economics of high volume textbook publishing is such that innovation is difficult to do. 

Monday, 27 February 2012

Government debt in Europe: some good and bad news.


Sunday, 26 February 2012

Going beyond Quantitative Easing

                I’ve been away for a few days at the OECD, so have only just picked up Scott Sumner, fully endorsed by Tyler Cowen, asking why there are not more people advocating a higher inflation target, or a nominal GDP target, in the UK. (Being away did not in theory prevent me blogging, but I’m afraid in practice I prefer exploring Paris!) I think this is a good question. While there is a very active UK debate about fiscal austerity, most discussion on the monetary side tends to be within the parameters of current policy.  
                Those familiar with the case for raising the inflation target can skip the next couple of paragraphs. For those who are not, the idea is that the central bank/government could moderate the impact of the zero lower bound constraint on interest rates by announcing that it would allow inflation to go above 2% for a significant period after the recession was over. This would help stimulate the economy today through various channels. One is that expected lower future short interest rates should reduce long term interest rates today, which would in turn stimulate borrowing by firms and consumers. Another is that, according to the New Keynesian Phillips curve, expected inflation today depends on expected inflation tomorrow, so if the central bank allowed above 2% inflation in the future, this would raise actual and expected inflation today, lowering real short term interest rates today. One of the interesting things about this policy proposal is that it is very New Keynesian rather than Old Keynesian.
                This policy was first suggested as a way out of Japan’s lost decade (when nominal rates were also stuck at the zero bound) by Paul Krugman, and subsequently formalised by Eggertsson and Woodford (Gauti B. Eggertsson & Michael Woodford, 2003. "Optimal Monetary Policy in a Liquidity Trap," NBER Working Papers 9968) among others. This paper suggests that the optimal policy can be approximated by replacing an inflation target with a price level target, because a price level target implies a period of excess inflation would automatically follow a period of insufficient inflation. Scott Sumner in particular has championed nominal GDP targeting, which would have similar effects, and this policy has gained a lot of support in the US and elsewhere.
                So why relatively little debate on this issue in the UK? At the political level, simple politics combined with recent experience may be important. Price inflation has been, and still is, high in the UK, and this is highly unpopular because it has been associated with large falls in real wages. An argument by any political party that the Bank should target higher inflation, rather than be admonished for its inability to prevent it, would be a hard sell. Nominal GDP (NGDP) targeting may be much more palatable to a non-macro audience, as Krugman points out. However a problem here for the government may be the accusation that such a change reflects a failure of their austerity programme, for reasons discussed below. Whether this issue might be on the Labour Party’s agenda I have no idea, although I cannot see any reason in principle why it should not be.
                What is perhaps more puzzling is a lack of discussion by the Bank itself. As far as I am aware, the Bank has not discussed these various alternatives to its current 2% mandate. I am also not aware of any members of the current MPC discussing them in public. Of course any decision to change the mandate would not be for the Bank or MPC to make – it’s a decision for the Chancellor - but that does not rule out discussion of options. I think this lack of ‘official’ discussion may also discourage debate elsewhere. (I know I thought of writing something myself on this a few weeks back, looked for something from the Bank as a ‘hook’ to argue with, and on finding nothing let it slide.) In contrast to the US, macroeconomic blogs in the UK are not developed or influential enough to initiate a debate themselves.
                The lack of public analysis from the Bank, or MPC members, could perhaps be another example of ‘groupthink’ that Laurence Ball suggests in his analysis of Bernanke’s views on the zero lower bound. My first experience of this came at a conference organised by the Centre for Central Banking Studies in 2009. Chris Sims and Mike Woodford were the other guest speakers, and both my and Mike’s paper provoked discussion of this policy issue. I have often been in meetings where an option may be politely discussed, but you just know it has no chance of serious consideration, and this seemed like one of those. To be honest, I think this represents central bank conservatism more than anything else.
                One of the main arguments against this policy option is time inconsistency. Even if a promise to raise future inflation was effective today, when the recession ended and it was time to implement the policy, the temptation would be to renege on this commitment and return to the 2% inflation target. A smart private sector would realise this, so the promise to raise future inflation would not be believed, and so it would not be effective. A price level or NGDP target is partly designed to help overcome this problem. However, in the case of the UK, where a change in policy would almost certainly have to be decided by the Chancellor rather than the Bank, this should be seen as less of a problem for the Bank or MPC. Its credibility would not be on the line, and the government rather than the Bank would come under pressure to renege.
                Exactly the same could be said of another objection to raising the inflation target, which is that it might be perceived as a way of helping the government reduce the ratio of debt to GDP. This charge could be a more serious concern for the Chancellor, if it was perceived that his austerity program was not delivering the fiscal target he had set himself. However, it should be less of a concern for the Bank, because they have always deferred to the Chancellor’s authority to set the inflation target. So for both reasons, I suspect the lack of discussion by the Bank and MPC may reflect a taboo about deliberately raising inflation above 2%.
                I should add that I think the advocates of NGDP targets sometimes go too far in suggesting that this is an obviously preferable way to speed economic recovery compared to fiscal stimulus. Promises to raise future inflation are costly, which is why there is a time inconsistency problem. However the current recession is, in my view, much more costly, so it needs both monetary and fiscal action to help bring it to a speedy end. Furthermore, the current recession may well indicate an endemic problem with low inflation targets, which is that we are in danger of hitting the zero bound quite frequently. (With this in mind, can anyone explain to me why the Bank of Japan has just announced an inflation target of only 1%?) This seems like an excellent time to be discussing alternatives to inflation targeting. 
So it is a pity that this policy option is not being debated more actively in the UK right now, with help from the Bank and MPC members. In the absence of a discussion based around the Bank, then this seems to be exactly the kind of issue that the Treasury Select Committee of the House of Commons should investigate. The committee has always taken a keen interest in all aspects of monetary policy, and such an investigation would be a good follow-up to their recent report on Bank accountability

Wednesday, 22 February 2012

The Balanced Budget Expansion Debate Begins?


Monday, 20 February 2012

2010 and Monetary Policy in the UK


Calculating social welfare

   Rising rates

   Flat rates
Output growth
   Rising rates

   Flat rates

Output gap
   Rising rates

   Flat rates


Saturday, 18 February 2012

Policy errors like 2010 austerity – what can academics do?


Thursday, 16 February 2012

On Hidden Motives

                Chris Dillow has a nice follow-up to my earlier blog on balanced budget fiscal expansion. I first read the Kalecki paper when I was at Cambridge, but for better or worse this is not part of the macro lectures I give at Oxford. We all miss Andrew Glyn a lot.
                Is this what I had in mind when I said that if the government argued against all the possible balanced budget spending and tax measures that might stimulate the economy, we might suspect other motives? Before trying to answer that, I should say that part of my complaint was that such policy ideas are not part of the public debate, so we do not know what the government’s response would be. (We could infer, from the fact that none of these policies are being pursued, that they would be against them). I should also note that the FT suggests that the Liberal Democrats are thinking about tax switches, although I have my doubts about whether raising the £10K tax threshold would be particularly effective at stimulating demand.
                When I drew parallels in an earlier post between the current UK situation and 1981, I mentioned by way of anecdote a little speech I made at the internal meeting of Treasury economists at the time. What I did not report was that at that meeting I made exactly the argument Kalecki puts forward. (Needless to say Kalecki was not normally quoted in discussions about budgets in the Treasury! - I was young, and probably knew I was going to leave fairly soon.) I think what Kalecki says made a good deal of sense in that particular context: as we were to find out, part of the Thatcher agenda was to take on the power of organised labour.
                Whether it makes sense in the current context I’m less sure. Some of the factors identified by Chris in a later post could simply be attempts to deflect sympathy for the unemployed (which in turn would translate into criticism of the government) rather than the more strategic design he suggests. What I probably had more in mind on this occasion were two things.
                The first involves the point about ideology which I have mentioned several times. If your ideological perspective is that ‘government is always the problem’ and that the private sector is best left alone, then blaming all our ills on the excesses of the previous government (rather than the financial system), and pursuing austerity by government as the means of correcting those ills fits well with that perspective. To use government intervention as a way of correcting a problem with the private sector (insufficient demand) does not.
The second is that nearly all the fiscal proposals I suggest involve redistributing money from the rich to the poor. This makes macroeconomic sense, because the poor are more likely to be credit constrained than the rich. It would also make sense from an equity point of view: the poor are suffering most as the result of austerity, as the chart below from the IFS illustrates. Unfortunately it does not make political sense for the current government.

                  There is also a familiar but important point here about political influence and recognition. Issues to do with debt and financial markets are reported daily and major players in this area have almost guaranteed access to politicians – from whatever party. They tend to be rich, and will complain about being taxed at 50%. The young unemployed, who now make up nearly a quarter of the 16-24 age group, have by comparison very little political voice. Even when they are talked about when monthly figures are released, we are likely to get stories about motivation and how to brush up your CV, rather than recognition that with many times more people looking for a job than there are vacancies no amount of self help will make the problem go away. (See this by Zoe Williams.) These are the political reasons why the ‘counsels of despair’ that Jonathan Portes rightly complained about are able to endure.

Wednesday, 15 February 2012

Can Nothing Be Done?

Or why is no one talking about balanced budget expansion?

                As UK unemployment continues to rise, Jonathan Portes asks why the government seems to accept this as inevitable. The same question could be asked in many other countries. The answer is invariably that nothing can be done by way of fiscal stimulus because debt and deficits are so high. Jonathan argues (rightly in my view) that concerns about debt in the short term are hugely exaggerated. I’ve suggested this is particularly true when we have Quantitative Easing. We seem to be in a strange prisoners dilemma where it is absolutely clear that the world wants more safe assets (the rate of interest on indexed debt is zero if not negative), but every individual government thinks that if it provides them lenders will suddenly panic, and think they are no longer safe.
                I think this fear is irrational, but unfortunately events in the Eurozone feed this fear on a daily basis. (It should not, because governments without their own central banks are in a different position from those that have, but that is a rational argument.) Taking notice of ratings agencies is also irrational (see Jonathan again), but it adds to the fear. So even though I think it is fairly easy to win the intellectual debate on debt, this may not be what is decisive.
                If governments believe that they cannot add to government debt and deficits, does that mean nothing can be done? Absolutely not. A temporary increase in government spending financed by an increase in taxes will still raise demand. First year economics undergraduate students will know about the balanced budget multiplier of one: every £1 spent by the government will lead to £1 extra demand, because what consumers lose with lower taxes they gain through higher income. Readers of Michael Woodford (2011) will know that we get exactly the same multiplier with much more sophisticated consumers, if real interest rates are fixed. (I try and explain why here.) So it does not matter what sort of consumers we have, the tax increase comes out of saving, and so demand and output rises by the full extent of the spending increase. (For those who think lower savings will mean lower investment, see here.)
                The news is better still if interest rates are stuck at the zero lower bound. Higher demand and output will imply some increase in inflation, and any increase in expected inflation will reduce real interest rates, further stimulating activity. The size of the multiplier will be above one.
                So there is something we can do with fiscal policy, without increasing government debt. Why does hardly anyone talk about this? (One exception is Robert Schiller.) I suspect the problem is as follows. Those favouring stimulus think debt is not a constraint, and know that there are many reasons why a fiscal expansion financed by issuing more debt will be even more expansionary that one financed through taxes. So why argue for second best? But why do those who do think debt is a constraint not welcome this alternative possibility of raising demand? The reason is obvious:  a tax financed fiscal expansion requires taxes to rise.
                The problem is not an economic one. The distortionary effects of temporarily higher taxes are likely to be small relative to the resources wasted and permanent damage caused by high unemployment. (See Chris Dillow as well as Jonathan Portes on this.) The problem is political, particularly for countries with right of centre governments. However, just because something may be politically difficult should not stop the argument being made.
                Once we get on to this territory, then there is further ground to explore. As well as tax financed government spending, we could think about tax and transfer switches that would stimulate demand. The marginal propensity to consume out of a benefit increase is likely to be quite high, whereas that out of reducing the tax relief on pension contributions for high earners would be pretty small. (Remember any tax switch need only be temporary.) Redistributing money from the old to the credit constrained young would also be likely to raise demand: raise child benefit by increasing death duties, for example. Some companies are not that short of cash at the moment: how about tax incentives to encourage them to invest today rather than tomorrow.
                The idea that there is no alternative to doing nothing about rising unemployment could not be further from the truth. If governments find objections to all these ideas, one might begin to suspect that there are other motives at work.

Tuesday, 14 February 2012

The trouble with teaching macroeconomics: minimum wages and immigration


Sunday, 12 February 2012

What have Keynesians learnt since Keynes?






Friday, 10 February 2012

Central Bank Interest Rate Forecasts: It’s not about accuracy

                Charles Goodhart writes (FT-£) that “Proposals that central bankers report their expectations of official rates, beyond some short future horizon, are retrograde, pushed forward by fashionable theory without reference to empirical reality.” By short horizon here I think he means three or six months: much shorter than the recent move by the US Fed. Charles is usually right about most things, and similar comments have also been made by other experienced ex-central bankers, so I think it is important to set out carefully one important counter argument.
                Charles writes that “whether the publication of central bank predictions of the future path of interest rates is likely to be beneficial depends on the relative accuracy of such forecasts.” I disagree. I’m happy to assume they are no better than those of forecasters in general. What is then gained by publication?
                The key point is that central banks, or members of a central bank committee, have inside knowledge. Not about how the economy works, or of statistics a few days before they are published, but about themselves. Their forecasts for interest rates tell us what they are likely to do if events (inflation, growth etc) turn out as they expect, and if they are being consistent. So the important question is whether this information is useful.
                Central to the academic case for delegation of interest rate decisions to central banks is that they are less susceptible to the temptations of time inconsistency. (Those familiar with what this means can skip this and the next paragraph.) A classic example involves the trade-off between inflation and output. Suppose the monetary authority wants zero inflation, but would like output above the level consistent with zero inflation (the ‘natural’ level of output). Suppose the public share those preferences. The monetary authority announces a policy of achieving zero inflation, and people form expectations on that basis. Once those expectations have been set, the monetary authority realises that outcomes would be better if output was higher than the natural rate. This will raise inflation above zero, but given their and the public’s views on output, everyone would be better off with a little bit more inflation and higher output.  This is sometimes called reneging or cheating by the policy maker, but notice that everyone is apparently better off when it changes its mind.
                Now, if people are smart, they will know the monetary authority will behave this way, so they will not believe the initial announcement of zero inflation. In fact the only situation in which expectations prove correct is when they are so high that it is no longer in the monetary authority’s interest to renege. So the outcome is high inflation with no gain in output. In this situation it would be much better if the monetary authority could commit to zero inflation and not renege on this commitment. It is generally thought that central banks are more likely to be able to do this than politicians, in part because politicians will be too tempted by short term gains, and will discount the longer term repercussions.
                Being an independent central bank may increase your ability to commit to a policy in the face of the time inconsistency temptation, but it does not guarantee that result. Central bankers would like to be able to establish their credibility for commitment. (I gave a particular example when it might matter a lot here.) Publishing interest rate forecasts allows them to do this. If events turn out roughly as expected, yet the central bank does not follow its own forecast for interest rates, it might be because they are exploiting these time inconsistency possibilities. Following your own forecasts when nothing changes does not prove that you are resisting such temptations, but it is consistent with doing so.
                Now Charles Goodhart might respond, in the spirit of his article, by saying that events never turn out roughly as expected, and so interest rate forecasts can never be used in this way. However the critical question is as follows. Is the fog of news so dense that we can never say anything useful using these forecasts? I think not. For a start, we not only have the bank’s interest rate forecasts, but also the inflation forecasts that go with them. We often have no problem saying that the balance of news about the economy over some period is – say – that activity is stronger than expected, and so inflation is expected to be higher. If, despite this, the central bank reduced interest rates compared to their own forecasts, we would be suspicious that they were being inconsistent. However, if we do not know what they were expecting to do with interest rates (because these forecasts were not published), then we are no wiser about whether they are being consistent or not.
                Charles talks about the importance of putting error bands around forecasts in general (the fan charts), and I could not agree more. However in this particular case, we do not need such bands. To the first approximation, we only need to know what their best guess was for future interest rates, and the associated best guesses for inflation and other variables. This is because we are using the interest rate forecast to judge consistency, and not as a forecast per se.
                Now perhaps the importance of time inconsistency problems in monetary policy is not as great as implied by the academic literature.  However, I think the chances of the public being misled by the publication of interest rate forecasts is so small that on this occasion it is worth taking this academic idea seriously. I believe that in ten years time, when more central banks publish interest rate forecasts in this way, we will wonder what all the fuss was about.