Why is 0! =1?

5 Jan, 2019 at 12:32 | Posted in Education & School | Comments Off on Why is 0! =1?


The single most important factor behind successful education — from kindergarten to university — is, and has always been — having a good teacher!

Erdogan — der am schnellsten beleidigte Präsident

4 Jan, 2019 at 21:53 | Posted in Politics & Society | Comments Off on Erdogan — der am schnellsten beleidigte Präsident

Erdoğan ist der Staatspräsident, der weltweit entweder am häufigsten beleidigt wird oder am schnellsten beleidigt ist. Seit seiner Wahl wurde gegen 68.817 Personen wegen Präsidentenbeleidigung ermittelt, innerhalb von drei Jahren wurden deshalb nahezu 13.000 Prozesse eröffnet und über 3000 Personen verurteilt …

47796-erdogan-beleidigenVor drei Monaten wurde in Antalya ein Bettler wegen Präsidentenbeleidigung festgenommen. Er kam wieder frei, als er auf der Wache klarstellte, der Cousin seiner Frau heiße ebenfalls Erdoğan, den habe er beschimpft, nicht den Präsidenten …

Der Journalist Onur Erem schrieb, wenn man bei Google nach “Mörder und Dieb” suche, schlage die automatische Vervollständigungsfunktion “Erdoğan” und “AKP” vor. Für den Bericht wurde er zu elf Monaten und zwanzig Tagen Haft verurteilt. Es würde mich nicht wundern, wenn auch Google aufgrund dieser Vorschläge von der Epidemie erfasst und wegen Beleidigung verurteilt werden sollte.

Can Dündar/Die Zeit

De dagar som blommorna blommar

4 Jan, 2019 at 21:14 | Posted in Varia | Comments Off on De dagar som blommorna blommar


Det bästa Gardell någonsin skapat. Lysande. Vacker. Omskakande. Gripande. Ett mästerverk.

De som talar om pengar

4 Jan, 2019 at 17:43 | Posted in Politics & Society | 3 Comments

De som framför allt dominerar i den svenska ekonomirapporteringen är ekonomer från banker och försäkringsbolag. Det visar en granskning av artiklar i svensk dagspress som Flamman har gjort.

fredagsmys-med-flamman_logoVi går in med olika värderingar och synsätt. Det gör att man kommer till ganska olika slutsatser. Fackliga ekonomer uttalar sig bara i sex procent av artiklarna. Arbetsgivarorganisationer i nästan 20. Och banker och försäkringsbolag utgör tillsammans över 40 procent …

Bäst representerade bland svenska företag i det material Flamman har gått igenom är Swedbank … Varje år lägger Swedbank och andra banker stora summor pengar på kommunikation. I Swedbanks fall talar man alltså om ”folkbildning”.

Men Ola Pettersson på LO kallar det snarare marknadsföring, och menar att Swedbanks dominans i den svenska ekonomibevaknigen helt enkelt är resultatet av ett riktat arbete med syfte att synas så mycket som möjligt …

Lars Pålsson Syll är nationalekonom och professor i samhällsvetenskap vid Malmö universitet … Han menar att läget i Sverige är sämre än i omvärlden. Här är de som Pålsson Syll kallar för mainstreamekonomer ännu mer dominerande än i andra länder …
– Sverige är ett litet land och det blir liksom inte utrymme för mer än en uppfattning i väldigt många ekonomiska frågor. De är de här standardsvaren man får då, standarduppfattningarna. Och vi som forskar som vet att det finns rätt många olika uppfattningar om ekonomi som aldrig kommer fram, och det ger bilden av att nationalekonomer är ungefär som fysiker eller naturvetare, som har en gemensam bas som de står på och alla tycker nästan samma sak. Så är det ju inte.

Flamman

Why Bayesianism has not resolved a single fundamental​ scientific​ dispute

3 Jan, 2019 at 23:10 | Posted in Economics, Theory of Science & Methodology | 3 Comments

419fn8sv1fl-_sx332_bo1204203200_Bayesian reasoning works, undeniably, where we know (or are ready to assume) that the process studied fits certain special though abstract causal structures, often called ‘statistical models’ … However, when we choose among hypotheses in important scientific controversies, we usually lack such prior knowledge​ of causal structures, or it is irrelevant to the choice. As a consequence, such Bayesian inference to the preferred alternative has not resolved, even temporarily, a single fundamental scientific dispute.

Mainstream economics nowadays usually assumes that agents that have to make choices under conditions of uncertainty behave according to Bayesian rules (preferably the ones axiomatized by Ramsey (1931), de Finetti (1937) or Savage (1954)) — that is, they maximize expected utility with respect to some subjective probability measure that is continually updated according to Bayes theorem. If not, they are supposed to be irrational, and ultimately — via some “Dutch book” or “money pump” argument — susceptible to being ruined by some clever “bookie”.

bayes_dog_tshirtBayesianism reduces questions of rationality to questions of internal consistency (coherence) of beliefs, but — even granted this questionable reductionism — do rational agents really have to be Bayesian? However, there are no strong warrants for believing so.

In many of the situations that are relevant to economics, one could argue that there is simply not enough of adequate and relevant information to ground beliefs of a probabilistic kind, and that in those situations it is not really possible, in any relevant way, to represent an individual’s beliefs in a single probability measure.

Say you have come to learn (based on own experience and tons of data) that the probability of you becoming unemployed in the US is 10%. Having moved to another country (where you have no own experience and no data) you have no information on unemployment and a fortiori nothing to help you construct any probability estimate on. A Bayesian would, however, argue that you would have to assign probabilities to the mutually exclusive alternative outcomes and that these have to add up to 1​ if you are rational. That is, in this case — and based on symmetry — a rational individual would have to assign probability 10% to become unemployed and 90% to become employed.

Its-the-lawThat feels intuitively wrong though, and I guess most people would agree. Bayesianism cannot distinguish between symmetry-based probabilities from information and symmetry-based probabilities from an absence of information. In these kinds of situations, most of us would rather say that it is simply irrational to be a Bayesian and better instead to admit that we “simply do not know” or that we feel ambiguous and undecided. Arbitrary an ungrounded probability claims are more irrational than being undecided in face of genuine uncertainty, so if there is not sufficient information to ground a probability distribution it is better to acknowledge that simpliciter, rather than pretending to possess a certitude that we simply do not possess.

We live in a world permeated by unmeasurable uncertainty – not quantifiable stochastic risk – which often forces us to make decisions based on anything but rational expectations. Sometimes we ‘simply do not know.’ There are no strong reasons why we should accept the Bayesian view of modern mainstream economists, according to whom expectations “tend to be distributed, for the same information set, about the prediction of the theory.” As argued by Keynes, we rather base our expectations on the confidence or “weight” we put on different events and alternatives. Expectations are a question of weighing probabilities by ‘degrees of belief,’ beliefs that standardly have preciously little to do with the kind of stochastic probabilistic calculations made by the rational agents modelled by mainstream economists.

The replicability crisis

3 Jan, 2019 at 16:07 | Posted in Statistics & Econometrics | Comments Off on The replicability crisis

 

Economists telling fairy tales

3 Jan, 2019 at 00:02 | Posted in Economics | Comments Off on Economists telling fairy tales

MAD-Magazine-Alfred-Quote-Thumb_56d9faade962a4.45249552An important point is implicit. Economics is not hard because of math. The math in even graduate level economics is no greater than in sophomore physics. Classical economics is hard because it can attack social problems in a value-free, cause-and-effect way, and upends the little morality stories that most people use to think about those problems — rents are high because landlords are greedy.

John Cochrane

Mainstream economists “attack social problems in a value-free way”? Only a Cato Institute fellow could come up with such nonsense!

20th anniversary for the euro — no reason for celebration

2 Jan, 2019 at 17:58 | Posted in Economics | 3 Comments

When the euro was created twenty years ago, it was celebrated with fireworks at the European Central Bank headquarters in Frankfurt. Today we know better. There are no reasons to celebrate the 20-year anniversary. On the contrary.

euroAlready since its start, the euro has been in crisis. And the crisis is far from over. The tough austerity measures imposed in the eurozone has made economy after economy contract. And it has not only made things worse in the periphery countries, but also in countries like France and Germany. Alarming facts that should be taken seriously.

Europe may face a future with growing economic disparities where we will have​ to confront increasing hostility between nations and peoples. What we’ve seen lately in France shows that the protests against technocratic attempts to undermine democracy may go extremely violent.

The problems — created to a large extent by the euro — may not only endanger our economies, but also our democracy itself. How much whipping can democracy take? How many more are going to get seriously hurt and ruined before we end this madness and scrap the euro?

The euro has taken away the possibility for national governments to manage their economies in a meaningful way — and in country after country, the people have had to pay the true costs of its concomitant misguided austerity policies.

The unfolding of the repeated economic crises in euroland during the last decade has shown beyond any doubts that the euro is not only an economic project but just as much a political one. What the neoliberal revolution during the 1980s and 1990s didn’t manage to accomplish, the euro shall now force on us.

austerity22But do the peoples of Europe really want to deprive themselves of economic autonomy, enforce lower wages and slash social welfare at the slightest sign of economic distress? Are​ increasing income inequality and a federal überstate really the stuff that our dreams are made of? I doubt it.

History ought to act as a deterrent. During the 1930s our economies didn’t come out of the depression until the folly of that time — the gold standard — was thrown on the dustbin of history. The euro will hopefully soon join it.

Economists have a tendency to get enthralled by their theories and models and forget that behind the figures and abstractions there is a real world with real people. Real people that have to pay dearly for fundamentally flawed doctrines and recommendations.

General equilibrium theory — nonsense on stilts

2 Jan, 2019 at 14:49 | Posted in Economics | Comments Off on General equilibrium theory — nonsense on stilts

General equilibrium is fundamental to economics on a more normative level as well. A story about Adam Smith, the invisible hand, and the merits of markets pervades introductory textbooks, classroom teaching, and contemporary political discourse.getbourse The intellectual foundation of this story rests on general equilibrium, not on the latest mathematical excursions. If the foundation of everyone’s favourite economics story is now known to be unsound — and according to some, uninteresting as well — then the profession owes the world a bit of an explanation.

Frank Ackerman

Almost a century and a half after Léon Walras founded general equilibrium theory, economists still have not been able to show that markets lead economies to equilibria.

We do know that — under very restrictive assumptions — equilibria do exist, are unique and are Pareto-efficient.

But after reading Frank Ackerman’s article — or Franklin M. Fisher’s The stability of general equilibrium – what do we know and why is it important? — one has to ask oneself — what good does that do?

As long as we cannot show that there are convincing reasons to suppose there are forces which lead economies to equilibria — the value of general equilibrium theory is nil. As long as we cannot really demonstrate that there are forces operating — under reasonable, relevant and at least mildly realistic conditions — at moving markets to equilibria, there cannot really be any sustainable reason for anyone to pay any interest or attention to this theory.

Stability that can only be proved by assuming Santa Claus conditions is of no avail. Most people do not believe in Santa Claus anymore. And for good reasons. Santa Claus is for kids, and general equilibrium economists ought to grow up, leaving their Santa Claus economics in the dustbin of history.

Continuing to model a world full of agents behaving as economists — “often wrong, but never uncertain” — and still not being able to show that the system under reasonable assumptions converges to equilibrium (or simply assume the problem away), is a gross misallocation of intellectual resources and time. As Ackerman writes:

The guaranteed optimality of market outcomes and laissez-faire policies died with general equilibrium. If economic stability rests on exogenous social and political forces, then it is surely appropriate to debate the desirable extent of intervention in the market — in part, in order to rescue the market from its​ own instability.

Statistics is no substitute for thinking

2 Jan, 2019 at 14:44 | Posted in Statistics & Econometrics | Comments Off on Statistics is no substitute for thinking

The cost of computing has dropped exponentially, but the cost of thinking is what it always was. That is why we see so many articles with so many regressions and so little thought.

Zvi Griliches

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