Acemoglu and Robinson have, on their blog, very kindly responded to the email I sent them.
However, I'm inclined to say that their purported explanation falls short of explaining the empirical puzzle presented.
They resort to what is effectively rentier state theory - resource rich countries can buy off their populations, other ones can't. Unfortunately, this theory has several gaps in it.
1. What about Morocco, Jordan, Bhutan, Swaziland?
These aren't resource rich countries. (current accounts in Morocco, Jordan, Bhutan, Swaziland, all of which hover at or below 0. Note that the recent spike in Bhutan is caused by the building of a large hydroelectric powerplant, the energy from which is mostly exported to India).
Resource wealth can explain Saudi Arabia and Bahrain handily, sure, but how compelling is it as an explanation for Oman? True, Oman has plenty of resource wealth -Oil and Gas exports approached 50% of GDP in 2008-, but its patterns of reform hardly match that of a King buying off his population with reform. Prior to the Arab Spring, the only major threat to Bin Said was the Dhofar rebellion, which began in 1965 under his father's reign. According to Joseph Kechinian, “Oman was not just experimenting with participatory government”, under Qaboos, but in fact it was choosing to “stay well ahead of changing circumstances.”[1] When you look carefully, Rentier State Theory can only explain about half of the puzzle.
Acemoglu and Robinson try to explain this away by saying "The genius of the regimes in Saudi Arabia, Qatar, and the United Arab Emirates has been to use their resources before there was much of a protest movement." which brings us to
2. Libya?
As Acemoglu and Robinson acknowledge, Libya is resource rich. But they say, it has chosen the path of repression, and therefore was doomed to fall. But wait- wasn't the question of whether a state chooses the path of repression or accommodation part of the very thing we were trying to explain in the first place? Why did Libya choose repression and not Qatar? Here the authors cite the UAE, and Saudi Arabia's 'genius' as the explanation for their pre-emptive appeasement. But if this is so, why were regional scholars as recently as 2006 saying things like "the U.A.E actually represents one of the purest autocracies in the world…second only to Saudi Arabia.”[2]
The enormous resources of the U.A.E. and Saudi Arabia is related to their continued preservation, surely- but it seems to me that the resources merely gave these countries the power to make few genuine concessions that threatened the monarchs' stranglehold on power. The same explanation cannot be true for Oman or Kuwait, where meaningful alternative's to the King's power exist. Moreover, that explanation clearly has no relevance in Jordan or Morocco, where resources are lacking. Expanding the sample outside of the Middle East ("Region only begs the question about the factors actually at work… region is merely a summary of factors that have taken on geographical form"[3]) demonstrates that other resource poor monarchies have also managed to survive - such as in Bhutan and also in Swaziland. Rentier State Theory cannot explain why.
Some of these questions I tried tackling, here (warning, this is another shameless plug of my thesis). The most striking snippet of information can be found on the simple table on page 26. Personally, I found most interesting the relationship between the timing of reforms and the age of the King.
[1] Joseph. A. Kechichian, Oman and the world, the emergence of an independent Foreign Policy, p54 (RAND, 1995)
[2] Christopher M. Davidson, ‘After Shaikh Zayed: The politics of Succession in Abu Dhabi and the UAE’ Middle East Policy, Volume 13(1), Spring 2006, p42
[3] Valerie Bunce, ‘Rethinking Recent Democratization, Lessons from the Postcommunist Experience’ World Politics 55(2) January 2003 pp 191-192
Wednesday, 21 March 2012
Friday, 16 March 2012
Empirical Puzzles from the Arab Spring
On Acemoglu & Robinson's excellent new blog "Why Nations Fail", they point out that the prospects for a peaceful resolution in Syria are bleak, to say the least.
Their post reminded me of an empirical puzzle that I noticed back at Uni. Why is it that Monarchs seem to behave so differently to autocrats when they are faced with rebellions? The Arab Spring (which those who know me will realise post-dates my thesis by some time) provides what seems to me to be clear evidence on this. Looking across the monarchies that have seen protests, Oman, Morocco, Jordan, Kuwait, Saudi Arabia and Bahrain, all have avoided out and out civil war or revolution, generally by buying off their populations and/or with small political liberalisations. By contrast, the dictatorships in Egypt, Yemen, Tunisia, Syria, Libya have been far less succesful, generally avoiding any conciliatory policies and hence often leading to total overthrow or civil war. In fact the only country that seems to somewhat buck the trend is Algeria, which politically as I understand it (which honestly is not that well) is somewhat less authoritarian than most of the other countries that benefitted from the Arab Spring. The case is bolstered still further when we look further at Monarchies outside the Middle East, such as Bhutan, Swaziland and Brunei.
The answer to why there is this difference is not immediately obvious.
In the end, I decided not to make this the central puzzle of my thesis, and instead focussed on an associated but more specific problem to do with the distribution of liberalisations within Monarchies (for anyone interested, that work, adapted to be reader friendly and without ugly tables, can be found here, pages 4&5 giving the best summary of what it is about). Given the events that have since happened, perhaps I ought to have focussed on this problem. I've sent these questions over to Acemoglu & Robinson, who were kind enough to write back to me indicating that they might deal with issue in an upcoming blog post. I look forward to reading their views.
Their post reminded me of an empirical puzzle that I noticed back at Uni. Why is it that Monarchs seem to behave so differently to autocrats when they are faced with rebellions? The Arab Spring (which those who know me will realise post-dates my thesis by some time) provides what seems to me to be clear evidence on this. Looking across the monarchies that have seen protests, Oman, Morocco, Jordan, Kuwait, Saudi Arabia and Bahrain, all have avoided out and out civil war or revolution, generally by buying off their populations and/or with small political liberalisations. By contrast, the dictatorships in Egypt, Yemen, Tunisia, Syria, Libya have been far less succesful, generally avoiding any conciliatory policies and hence often leading to total overthrow or civil war. In fact the only country that seems to somewhat buck the trend is Algeria, which politically as I understand it (which honestly is not that well) is somewhat less authoritarian than most of the other countries that benefitted from the Arab Spring. The case is bolstered still further when we look further at Monarchies outside the Middle East, such as Bhutan, Swaziland and Brunei.
The answer to why there is this difference is not immediately obvious.
In the end, I decided not to make this the central puzzle of my thesis, and instead focussed on an associated but more specific problem to do with the distribution of liberalisations within Monarchies (for anyone interested, that work, adapted to be reader friendly and without ugly tables, can be found here, pages 4&5 giving the best summary of what it is about). Given the events that have since happened, perhaps I ought to have focussed on this problem. I've sent these questions over to Acemoglu & Robinson, who were kind enough to write back to me indicating that they might deal with issue in an upcoming blog post. I look forward to reading their views.
Thursday, 15 March 2012
Sri Lanka's Killing Fields, War Crimes Unpunished
This truly horrifying programme documents multiple war crimes in Sri Lanka. Graphic violence, and disturbing throughout, but nonetheless a rare example of important journalism.
Channel 4 Documentary on Sri Lanka's Unpunished War Crimes
Channel 4 Documentary on Sri Lanka's Unpunished War Crimes
Monday, 12 March 2012
Which Macroeconomic Model Best Describes Reality?
Another one of my Quora answers that got traction reproduced here:
TL;DR
1. No economic models accurately describe reality
2. No economic models are very good at making predictions about the future
3. The Smets-Wouters (2003 & 2007) model is considered the best of a bad bunch, the dwarf among pygmies.
Smets-Wouters, 2003 & 2007 is generally considered the most accurate general model of the economy in macroeconomics, when it comes to prediction[1] (note that this is different to 'describes reality most accurately', but I'll get on to this distinction later). It operates in the New Keynesian (or sometimes called the New Neoclassical Synthesis) school of thought, meaning that it takes a 'Dynamic Stochastic General Equilibrium' framework (in other words it works out its equations by examining individual, household maximising behaviour), but incorporates into that framework, multiple frictions, such as wage and price stickiness.
What are the main findings of this model?
While “demand” shocks such as the risk premium, exogenous spending and investment specific technology shocks explain a significant fraction of the short-run forecast variance in output, both wage mark-up (or labour supply) and to a lesser extent productivity shocks explain most of its variation in the medium to long run. Second, in line with Galí (1999) and Francis and Ramey (2004), productivity shocks have a significant short-run negative impact on hours worked. This is the case even in the flexible price economy because of the slow adjustment of the two demand components following a positive productivity shock. Third, inflation developments are mostly driven by the price mark-up shocks in the short run and the wage mark-up shocks in the long run.[2]
In other words, in the short run, Government Spending, Risk Appetite and technological progress that requires heavy investment to be realised explains output, whilst classical factors like Labour Supply and (to a lesser extent) productivity shocks matter in the long run. Productivity shocks matter less because they are offset by changes in hours worked, so that if people start earning more per hour, they simply choose to work fewer hours.
However, even though this is the "best" model, that does not mean it is very good! In fact, the performance of the model and models of its class are remarkably bad, given their significance in policy making.
The image below shows the performance of these models against the Fed's "Greenbook model" (GB) and against a purely statistical model with no theoretical underpinning (BVAR). Anything below one means that model has more accurate predictions.
CAVEAT
Strictly speaking, this has not answered your question. Afterall, you asked "what model describes reality most accurately" - the only answer to that question is that economic models do not describe reality.
The job of an economic model is not to accurately describe reality, but rather, to accurately summarise the relationships between economic variables, such as output and inflation. It tells you what happens to inflation for a given change in output, and it gives you a systematic way of thinking about that relationship, but it does not pretend to give you a "true" story, in the sense that the truth is something along the lines of, well household a,b,c,d had a little bit more money, and they got together and said, lets spend on this on a trip to Paris, and then the airline that provides flights to Paris saw a 7% rise in demand. Since they didn't have the capacity to meet this demand, the board sat down and said "Look, we either raise our prices, or we keep them constant. Raising our prices will earn us more money in the short run, but may ultimately damage our brand". There was 14-5 split on the board in favour of raising prices, so prices went up. And then something similar also happened for groceries, and televisions etc etc. Obviously, no economic model is therefore going to accurately describe reality, in the way that a historical account might do. In general, therefore economists' models are judged on how useful they are, rather than how accurately they describe reality.
[1] http://www.voxeu.org/index.php?q=node/6158
[2] http://www.ecb.int/pub/pdf/scpwps/ecbwp722.pdf
TL;DR
1. No economic models accurately describe reality
2. No economic models are very good at making predictions about the future
3. The Smets-Wouters (2003 & 2007) model is considered the best of a bad bunch, the dwarf among pygmies.
Smets-Wouters, 2003 & 2007 is generally considered the most accurate general model of the economy in macroeconomics, when it comes to prediction[1] (note that this is different to 'describes reality most accurately', but I'll get on to this distinction later). It operates in the New Keynesian (or sometimes called the New Neoclassical Synthesis) school of thought, meaning that it takes a 'Dynamic Stochastic General Equilibrium' framework (in other words it works out its equations by examining individual, household maximising behaviour), but incorporates into that framework, multiple frictions, such as wage and price stickiness.
What are the main findings of this model?
While “demand” shocks such as the risk premium, exogenous spending and investment specific technology shocks explain a significant fraction of the short-run forecast variance in output, both wage mark-up (or labour supply) and to a lesser extent productivity shocks explain most of its variation in the medium to long run. Second, in line with Galí (1999) and Francis and Ramey (2004), productivity shocks have a significant short-run negative impact on hours worked. This is the case even in the flexible price economy because of the slow adjustment of the two demand components following a positive productivity shock. Third, inflation developments are mostly driven by the price mark-up shocks in the short run and the wage mark-up shocks in the long run.[2]
In other words, in the short run, Government Spending, Risk Appetite and technological progress that requires heavy investment to be realised explains output, whilst classical factors like Labour Supply and (to a lesser extent) productivity shocks matter in the long run. Productivity shocks matter less because they are offset by changes in hours worked, so that if people start earning more per hour, they simply choose to work fewer hours.
However, even though this is the "best" model, that does not mean it is very good! In fact, the performance of the model and models of its class are remarkably bad, given their significance in policy making.
The image below shows the performance of these models against the Fed's "Greenbook model" (GB) and against a purely statistical model with no theoretical underpinning (BVAR). Anything below one means that model has more accurate predictions.
CAVEAT
Strictly speaking, this has not answered your question. Afterall, you asked "what model describes reality most accurately" - the only answer to that question is that economic models do not describe reality.
The job of an economic model is not to accurately describe reality, but rather, to accurately summarise the relationships between economic variables, such as output and inflation. It tells you what happens to inflation for a given change in output, and it gives you a systematic way of thinking about that relationship, but it does not pretend to give you a "true" story, in the sense that the truth is something along the lines of, well household a,b,c,d had a little bit more money, and they got together and said, lets spend on this on a trip to Paris, and then the airline that provides flights to Paris saw a 7% rise in demand. Since they didn't have the capacity to meet this demand, the board sat down and said "Look, we either raise our prices, or we keep them constant. Raising our prices will earn us more money in the short run, but may ultimately damage our brand". There was 14-5 split on the board in favour of raising prices, so prices went up. And then something similar also happened for groceries, and televisions etc etc. Obviously, no economic model is therefore going to accurately describe reality, in the way that a historical account might do. In general, therefore economists' models are judged on how useful they are, rather than how accurately they describe reality.
[1] http://www.voxeu.org/index.php?q=node/6158
[2] http://www.ecb.int/pub/pdf/scpwps/ecbwp722.pdf
Subscribe to:
Posts (Atom)