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Les fétichistes du PIB

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2009-09-07

NEW YORK – S’efforcer de ressusciter l’économie de la planète tout en réagissant au changement climatique soulève une question épineuse : les statistiques sont-elles de bons indicateur des mesures à prendre ? Dans un monde axé sur la performance, les chiffres ont pris une importance accrue : ce que l'on mesure affecte nos actions.

En effet, si les résultats sont faibles, nos efforts (par exemple d'augmenter le PIB) peuvent contribuer à détériorer le niveau de vie. Nous pouvons aussi nous retrouver confrontés à de faux choix, en croyant, à tort, que le rendement compromet la protection environnementale. En revanche, une meilleure appréciation de la performance économique pourrait montrer que les mesures prises pour améliorer l’environnement sont bénéfiques à l’économie.

Il y a dix-huit mois, le président français Nicolas Sarkozy a créé une Commission sur la Mesure de la Performance Économique et du Progrès Social, car il n'était pas satisfait – il n'était d'ailleurs pas le seul – de l’information statistique de l'époque sur l’économie et la société. Cette commission publiera son rapport tant attendu le 14 septembre.

La grande question est de savoir si le PIB est un bon outil de mesure du niveau vie. Dans beaucoup de cas, les statistiques afférentes semblent suggérer que l'économie se porte bien mieux que ce que les citoyens ressentent. En outre, la mise en avant du PIB génère des conflits : on exige des responsables politiques qu’ils le portent à son maximum, tandis que les citoyens attendent aussi qu’ils soient attentifs à l’amélioration de la sécurité, à la réduction de la pollution sonore, de l’air, de l’eau, etc. En bref, à tout ce qui pourrait saper la croissance du PIB.

Le fait que le PIB est un piètre indicateur du bien-être, voire de l'activité des marchés, est admis depuis longtemps. Mais l’économie et les modifications de la société peuvent aussi avoir eu leur influence, au moment même où les percées en économie et en technique statistique offraient de nouvelles chances d'améliorer notre métrique.

Le PIB est censé mesurer la valeur de la production de biens et services. Or dans un secteur clé – celui du gouvernement par exemple – nous ne disposons d’aucun outil pour le faire. La production est souvent mesurée, très simplement, en fonction de l'apport. Donc si le gouvernement dépense plus – même s’il est inefficace – la production augmente. Au cours des 60   dernières années, la part gouvernementale dans la production du PIB a augmenté de 21,4 % à 38,6 % aux Etats-Unis, de 27,6 % à 52,7 % en France, de 34,2 % à 47,6 % au Royaume-Uni et de 30,4 % à 44,0 % en Allemagne. Voilà qu’un problème mineur à l’origine est devenu majeur.

Parallèlement, l’amélioration de la qualité (de meilleures voitures au lieu d’une plus grande quantité de voitures) représente de nos jours une part très importante de l’augmentation du PIB. Or, l’amélioration de la qualité est difficilement quantifiable. Le système de soins de santé en est un bon exemple : la majeure partie est financée de manière publique tandis que la plupart des avancées sont qualitatives.

Comparer différents pays comporte le même lot de problèmes que de faire des comparaisons dans le temps. Les Etats-Unis dépensent plus que tout autre pays (per capita et en pourcentage du revenu) pour son système de santé, mais obtiennent une mauvaise performance. Le système de mesure pourrait donc expliquer, pour partie, la différence du PIB par habitant aux Etats-Unis et dans quelques pays européens.

Un autre changement frappant dans beaucoup de sociétés réside dans les inégalités. Il y a en effet davantage de disparités entre le revenu moyen (calcul d’une moyenne) et le revenu médian (celui d’une personne « typique », dont le revenu se situe au milieu de la fourchette de tous les revenus). Si quelques banquiers s’enrichissent massivement, le revenu moyen augmente, même si le revenu de la plupart des individus reflue. Donc les statistiques du PIB per capita ne se font pas le reflet exact de la vie des citoyens.

Aussi, pour évaluer les biens et les services, nous utilisons les prix du marché. Mais à l’heure actuelle, même ceux qui vouent une grande foi dans les marchés remettent en question la validité de ces chiffres, y opposant les comptabilisations au prix du marché. Les profits faits dans les banques avant la crise – un tiers de tous les profits d’entreprise – ont l’apparence d’un mirage.

Cette prise de conscience éclaire d’un jour nouveau non seulement la mesure de la performance, mais aussi nos déductions. Avant la crise, lorsque la croissance des Etats-Unis (d’après les outils de mesure standard du PIB) paraissait bien plus forte que celle de l’Europe, nombre d’européens étaient en faveur du capitalisme à l’américaine. Bien sûr, tous ceux qui le désiraient auraient pu constater l’endettement croissant des foyers américains, ce qui aurait tendu à montrer que la vision du succès donnée par la mesure du PIB était erronée.

De récentes avancées méthodologiques nous ont permis de mieux évaluer ce qui contribue au sentiment de bien-être chez les citoyens et à rassembler les données nécessaire pour y procéder régulièrement. Ces analyses examinent et quantifient ce qui devrait être évident : la perte d’un emploi implique des répercussions plus considérables que la perte d’un revenu seul. Elles montrent aussi l’importance des liens sociaux.

Toute bonne mesure de notre état doit aussi prendre en compte la durabilité. Ainsi qu’une entreprise a besoin de quantifier la dépréciation de son capital, les comptes nationaux, aussi, doivent refléter la diminution des ressources naturelles et la dégradation de l’environnement.

Les statistiques visent à résumer ce qui se passe dans notre société complexe en quelques chiffres interprétables aisément. L’évidence que l’on ne peut tout réduire à un chiffre unique, le PIB, aurait dû nous frapper. Le rapport de la Commissions sur la Mesure de la Performance Economique et du Progrès Social mènera, espérons-le, à une meilleure compréhension des us et abus des statistiques.

Ce rapport devrait aussi fournir des axes sur lesquels fonder un plus large éventail d'outils reflétant de manière plus précise à la fois le bien-être et la durabilité. Il devrait aussi fournir une base dynamique pour améliorer la capacité du PIB et des statistiques afférentes à évaluer la performance de notre économie et de notre société. De telles réformes nous aideront à orienter nos efforts (et ressources) dans les directions menant à l’amélioration des deux.

Joseph E. Stiglitz, professeur d’économie à l’université de Columbia et lauréat du prix Nobel d’économie 2001 a aussi présidé la Commission sur la Mesure de la Performance Économique et du Progrès Social.

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tvselvakumaran 05:30 30 Sep 09

The official consensus

Professor Martin Feldstein's latest article, "The G-20's Empty Promises" on Project Syndicate needs careful consideration. In his article, Professor Feldstein essentially adopts the "official consensus" of the economics profession on the current economic crisis. This official consensus, in its various mainfestations, has also been elaborated on by other famous economists, notably Professor Robert Lucas in his article in the Economist in early August, and by Professor Paul Krugman in his recent article in the New York Times Magazine. One characterizing feature of this official consensus is a confidence (a.k.a. triumphalism) in the certainty of outcomes predicted by modern economic theory. The main precepts of this official consensus are

(i) Professor Ben Bernanke, the Chairman of the Board of Governors of the Federal Reserve, has at his disposal all the theoretical tools of economics that are necessary and sufficient to deal with the current economic crisis. As Professor Lucas explains it in his Economist article, if one were able to predict in advance exactly when a market crash would occur, it would imply that the market entertains arbritrage opportunities. Hence, it is not possible to predict financial crises in advance. However, except for the precise timing of the occurrence of financial crises, macroeconomic theory could explain the workings of the economy completely. In particular, to avert the recurrence of the Great Depression, certain actions were needed to be taken by the Fed -- the specifics of these actions were all clearly understood by the economics profession. However, it was politically untenable to take these actions before there was a financial crisis. Once the financial crisis occurred though, Professor Bernanke could intervene in the markets and take the necessary actions (in the Fall of 2008). These actions include the injection of several trillion dollars into the economy and making the availability of credit the cheapest possible. The actions taken by the Fed have now resulted in the economy avoiding a recurrence of the Great Depression. This is, in brief, what Professor Lucas has stated in his Economist article.

(ii) Thus in Professor Lucas' interpretation of things, the collapse of Lehman Brothers, for example, was necessary, in order to justify the intervention of the Federal Reserve in the functioning of the markets. The collapse of Lehman Brothers was, although regrettable, an unavoidable event. But, on the whole, monetary policy, even if it is a profligate one, would be necessary and sufficient to prevent the recurrence of the Great Depression, in Professor Lucas' view. Furthermore, the old wisdom of the Chicago School that government should be kept minimal at all times continues to hold, even in light of the current economic crisis. The Keynesians led by Professor Krugman, on the other hand, believe that Lehman Brothers should never have been allowed to fail. In their view, when the Fed's fund rate is at zero, monetary policy is largely ineffective for sustaining and stimulating economic activity. This is because of liquidity traps caused by businessmen who don't see economic opportunities that would induce them to borrow the cheap money available from the banks. Hence the government should step in to provide massive fiscal assistance to the economy by taking on spending directly, even if it means assuming trillions of dollars of public debt.

(iii) Professor Krugman scored a lot of points by pointing out that the current state of economic theory, highly influenced as it is by the efficient market hypothesis of the Chicago School, indicated that a crisis of such magnitude as the current economic crisis could not happen at all. This fundamental failure to recognize that an enormous crisis could indeed happen, calls for the overthrow of the policy that markets provide the best social gain when they are completely free from government interference. From first impressions, it might seem that the views of the monetarists and Keynesians are vastly different. However, it is important to note that in the view of the Keynesians too, once large scale government spending as prescribed by the Keynesians is instituted, there is again enough assurance that modern economic theory (although with a heavy Keynesian tilt) would be sufficient to deal with the current economic crisis.

(iv) In this regard, perhaps it is relevant to refer here to Professor Robert Shiller's latest article, "Re-inventing Economics" on Project Syndicate. Professor Shiller points out that the free market ideology fails to identify bubbles. Because of the belief that markets know best on all occasions, bubbles cannot occur according to the free market ideology. Professor Shiller's approach pursues a different branch of the Keynesian school of thought than the big spenders. Rather than advocate large government spending to avert a depression, Professor Shiller proposes using techniques from behavioral psychology to predict bubbles in advance. In this way, the socially harmful effects of massive misallocations of capital that arose in the case of the housing bubble or the tech bubble could be prevented in the future. In his other recent article, "Echo Chamber of Boom and Bust" in the New York Times, Professor Shiller elaborates further on the techniques that one could use for studying bubbles. Briefly, the process by which confidence or panic spreads in markets is very similar to the process by which diseases spread among populations. This outlook allows for introducing methods that scientists use to study epidemics into the study of bubbles.

(v) The Keynesians have also managed to re-write the conventional wisdom on the advantages of a strong dollar. Through the works of Professors Barry Eichengreen, Jeffrey Sachs and Ben Bernnake, a consensus has developed that attempting to support the gold standard was a major cause for the prolongation of the Great Depression. This has resulted in a viewpoint among economists that a devaluation of the dollar at present would help to reduce global imbalances by restoring the American manufacturing industry. The implications of this viewpoint were analyzed by Professor Feldstein in his July 2009 article "America's Saving Rate and the Dollar's Future" on Project Syndicate, with the conclusion that devaluation of the dollar would necessarily lead to a better future for America. Lost in this new interpretation is the fact that a stable dollar provides many economic benefits for America. The equity premium for American companies taking more risks globally, the transaction charges for providing market making facilities in global markets, and the provisions of liquidity for the currency of international trade are major drivers of economic growth for America, which derive from the dollar being the global reserve currency.

(vi) Some other Keynesians have gone beyond questioning just the free market ideology. For example, in his latest article, "GDP Fetishism" on Project Syndicate, Professor Joseph Stiglitz proposes a broad set of economic indicators like health, well-being and sustainability rather than a narrow focus on GDP growth. Yet other developments imply that the rest of the world is steadily moving away from using the dollar as the main reserve currency. To finance this new global reserve system, the IMF has created $250 billion worth of Special Drawing Rights (SDR), and the IMF has indicated its intention to triple this allocation of $250 billion in the future. It would need a strong commitment from the policy-makers in America to re-claim for the dollar its position as the predominant global reserve currency. However, judging from the writings of American economists like Professor Feldstein, it appears that the consensus among professional economists favors devaluing the dollar instead.

(vii) The official consensus is a result of a grand compromise between the Chicago School economists and the Keynesians.The conservative economists of the Chicago School would like to avoid the embarassment of getting publicly criticized for the failures of the efficient market hypothesis that this current economics crisis has severely exposed. So famous conservative economists like Professor Lucas have reached out for a consensus by indicating their willingness for a compromise. This compromise involves among other things, (a) foregoing raising concerns about the government's mismanagement of Fanie Mae and Freddie Mac, and (b) lending support to the Fed and the Treasury in their efforts to stabilize the economy, even if the methods that the Fed and the Treasury employ are highly inefficient. What are the Keynesians compromising on? Well, the Western liberal tradition has been intellectually bankrupt ever since the late 1960s. It is only the free market ideology of the Chicago School that has served as the driver of wealth creation in the advanced countries during the last four decades. Hence, the official consensus is a convenient compromise for the Keynesians to avoid asking difficult questions about the future of the Western liberal tradition. Instead, they would like to enact much drama in the media about the resurrection of their hero, John Maynard Keynes.

(viii) One other characterizing feature of the official consensus in the economics profession is a collective tendency to "Blame It All On Obama". The conservative economists blame President Obama for not focusing adequately on America's ballooning national debt. The liberals, led by Professor Krugman, fault President Obama for getting distracted from the left's free spending ways by concerns on the size of the fiscal deficit. In the confusion that has ensued, President Obama's own team of economics advisors has fallen back on the official consensus in the economics profession. Availing themselves of the security provided by this official consensus, President Obama's economics team has misled the President thoroughly in economic matters. To begin with, the President is only empowered to administer the nation's affairs for a four year term. The projections put out by the Congressional Budget Office (CBO) for the deficits in the next decade are only a non-authoritative guidance for where the nation's finances would be, if current policies hold for the next decade. Instead, the democrats have been behaving as if the $9 trillion of additional public debt that the CBO projects for the next decade is already a given certainty. In particular, they have not been careful to mention clearly in public discussions how much of this extra spending can be attributed to the President's own spending plans in his current four-year term. Neither have they shown any concerns for taking the Fed and the Treasury to taks for their highly inefficient methods to stabilize the economy. Because of these instances of neglect, the public is not willing to trust the government in financial matters. President Obama has rapidly lost his approval ratings. Professor Lawrence Summers, Professor Christina Romer, Professor Austan Goolsbee and Professor Peter Orszag are directly responsible for this abuse of public trust.

(ix) The official consensus has also prevented economists from recognizing that President Obama's universal message of tolerance and justice, which has been received very favorably all around the world, actually opens up vast areas of economic opportunity for America. Unfortunately, it does not matter, for the economists, whether George W. Bush or Barack Obama is in office. The most they can do is re-work their models to favor Keynesian policies, and to argue that the policies they propose arise directly from their number-crunching methods. One might be tempted to attribute this widespread consensus among economists to stick to a narrow theoretical interpretation of the current economic crisis, to the certainty afforded by the mathematical models, which have become indispensible through the course of the 20th century, for the development of economic theory. However, this would be a big mistake. The official consensus in the economics profession is primarily a result of undue influences of power and money. It is much less a result of mathematically based economic theory. In the long-term, this attitude among economists of sticking to an official consensus is going to do serious damage to the American economy. Some other aspects of the official consensus have been explained very well by Professor Kenneth Rogoff in his recent article, "The Confidence Game" on Project Syndicate. I recommend that the reader go through that article. The official consensus is the single largest threat to a robust recovery in the global economy. The official consensus also gravely misinterprets the events of the Great Depression. The implications of this misinterpretation bear directly on the economic health of America.



AUTHOR INFO

Joseph E. Stiglitz is University Professor at Columbia University, a Nobel laureate in economics, and the author of Freefall: Free Markets and the Sinking of the Global Economy.