Kling Klanger

I greatly admire the writings on economics by Arnold Kling. His recent comment on IQ is deficient, however. He falls into the trap of regarding mental abilities as specific when the whole thrust of a century of research into IQ shows that they are general. Everybody has things that they are best at but in general a person who is good at solving one sort of problem will be good at solving many sorts of problems. IQ represents in fact precisely that general ability which Kling concedes is badly needed in today's world. IQ is therefore a useful sorting method for determining in advance who can handle college education. And the SAT that is much used for that purpose in the USA is in fact little more than an IQ test.

To be fair, Kling seeems to be talking about top talent rather than normal ability. He is correct that extreme ability in any field is poorly predicted by IQ tests. Once you get into the genius range (say the top 2%) IQ tests can no longer sort out who will be the highest achievers among that population.

But Kling seems to conclude from that that IQ tests are not GENERALLY useful -- which is false. There may of course be a few rare cases where a person of genius ability in some particular field cannot make it into the top 20% of IQ scorers and who might therefore in a strict system be barred from higher education. But making provision for exceptional cases is part of any form of administration. Teachers do it all the time already when they award marks. So that poses no great difficulty.

Footnote:

Perhaps an example of ability generalizing might be in order -- to show what I mean:

My own greatest ability is getting papers published in academic journals. I am exceptionally good at that -- which is why I have had hundreds published. Papers which I have taken only a day to write generally get accepted for publication whereas some of my unfortunate colleagues labour for a year over a paper and then get it knocked back.

So I am hopeless at other things, right? Yes. I am a total washout at sport for instance. But I am also reasonably good at many apparently unrelated things. I am good at fixing old locks, for instance, and I have been quite successful in business.

But I am no billionaire and any locksmith is better at fixing locks than I am. I have just the one special ability but, associated with that, I also have a range of lesser abilities in which I am no world-beater but in which I do better than most. And that is pretty much how abilities generally are related to one another.

Jesus put it rather bluntly: "To him that hath, more will be given him. And to him that hath not, what little he hath will be taken away".

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