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(for those familiar with the history of biology, Gould's use of "homunculus" is terribly witty)
"I am particularly fond of this example [the Linda problem] because I know that the [conjoint] statement is least probable, yet a little homunculus in my head continues to jump up and down, shouting at me—“but she can’t just be a bank teller; read the description.” Stephen J. Gould[1]
And for MFOers who don't understand why we'd be prattling on about this, here is a recent mention of this fallacy by Clifford Asness of AQR on his personal blog site; he sounds a bit consternated, no?When people are asked to compare the probabilities of a conjunction and one of its conjuncts, they sometimes judge that the conjunction is more likely than one of its conjuncts. This seems to happen when the conjunction suggests a scenario that is more easily imagined than the conjunct alone. Psychologists Kahneman and Tversky discovered in their experiments that statistical sophistication made little difference in the rates at which people committed the conjunction fallacy. This suggests that it is not enough to teach probability theory alone, but that people need to learn directly about the conjunction fallacy in order to counteract the strong psychological effect of imaginability.
The Crowd by Gustave Le Bon published way back in 1895 yet as topical as ever. I really think RPHYX isn't all that bad albeit not my cup of tea. RSIVX I said before is a mediocre fund (actually less than mediocre now) and heavens forbid if Jim Rogers and Carl Icahn are correct in their assessment that something real ugly is brewing in corporate junk debt. As an aside, PONDX which has been mentioned favorably on MFO numerous times, just doesn't seem to get the love that undeserving RSIVX does. PONDX, swelled assets and all just keeps truckin on.@TSP_Transfer: Thanks for the lead on PTIAX. It's an interesting looking company and group of seemingly smart managers. I have much regret about getting into RPHYX and RSIVX after acting on what I read on MFO.
Have you investigated lazy portfolios? The concept of rebalancing implies not picking at a top, but taking a bit of profit as a position becomes overweighted (sell high), yet "lets its profits run" on the remaining position. The profit taken is then invested in lower performing position as in "buy low". Some links:The less tinkering I do, the better...the "set-it-and-forget-it" approach appeals to me. I just wonder what the criteria are for selling one sector and buying another...hopefully, at the top!
In contrast, Primecap Odyssey funds (e.g. POGRX) paid PRIMECAP Management Company 0.55% last year. From its prospectus:For the fiscal year ended September 30, 2014, the advisory fee represented an effective annual rate of 0.20% of the Fund’s average net assets.
Vanguard may strike a hard bargain, but PRIMECAP Management Company still made money on that deal, and paid taxes on it.For the fiscal year ended October 31, 2014, the Advisor received advisory fees of 0.55% of the average daily net assets of each Fund.
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