Lars P. Syll

The stuff of genius Several years later I developed a broader theory of what separates the two general classes of learners—helpless versus mastery-oriented. I realized that these different types of students not only explain their failures differently, but they also hold different “theories” of intelligence. The helpless ones believe that intelligence is a fixed trait: you have only a certain amount, and that’s that. I call this a “fixed mind-set.” Mistakes...

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Joan Robinson and the inadequacies of revealed preference theory We are told nowadays that since utility cannot be measured it is not an operational concept, and that ‘revealed preference’ should be put in its place. Observable market behaviour will show what an individual chooses … It is just not true that market behaviour can reveal preferences. It is not only that the experiment of offering an individual alternative bundles of goods, or changing his...

Paul Romer on Richard Thaler I understand the purely aesthetic appeal of a convincing scientific explanation … The problem is that people can derive aesthetic pleasure from many different types of “explanation.” After all, the problem with the traditional choice model based on conscious utility maximization is not that it is ugly. And, on grounds of mathematical beauty, no economic model can touch a theory of perfect competition grounded in convex duality....

If a demand function for the economy as a whole is to be estimated, just drawing upon the economy’s overall income and the price system, is it legitimate to use the demand system derived for an individual? In other words, can we estimate demand functions independently of the distribution of income and preferences across consumers? Not surprisingly, the answer is no in general, and the conditions for it to be yes are extremely stringent, indeed unrealistically so. Essentially,...

How to get published in top economics journals If you think that your paper is vacuous, Use the first-order functional calculus. It then becomes logic, And, as if by magic, The obvious is hailed as miraculous. Paul Halmos div{float:left;margin-right:10px;} div.wpmrec2x div.u > div:nth-child(3n){margin-right:0px;} ]]> Advertisements

Putting theories to the test Mainstream neoclassical economists often maintain — usually referring to the methodological individualism of Milton Friedman — that it doesn’t matter if the assumptions of the theories and models they use are realistic or not. What matters is if the predictions are right or not. But, if so, then the only conclusion we can make is — throw away the garbage! Because, oh dear, oh dear, how wrong they have been! The empirical and...

Axioms — things to be suspicious of To me, the crucial difference between modelling in physics and in economics lies in how the fields treat the relative role of concepts, equations and empirical data … An economist once told me, to my bewilderment: “These concepts are so strong that they supersede any empirical observation” … Physicists, on the other hand, have learned to be suspicious of axioms. If empirical observation is incompatible with a model, the...

Thaler and behavioural economics — some critical perspectives Although discounting empirical evidence cannot be the right way to solve economic issues, there are still, in my opinion, a couple of weighty reasons why we perhaps shouldn’t be too excited about the so-called ’empirical revolution’ in economics. Behavioural experiments and laboratory research face the same basic problem as theoretical models — they are built on often rather artificial conditions...

Keynes — the first behavioural economist To-day, in many parts of the world, it is the serious embarrassment of the banks which is the cause of our gravest concern … [The banks] stand between the real borrower and the real lender. They have given their guarantee to the real lender; and this guarantee is only good if the money value of the asset belonging to the real borrower is worth the money which has been advanced on it. It is for this reason that a...