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Steve Keen’s Accidental Demonstration of the Efficient Market Hypothesis

Following the release of the ABS house price data for the September quarter, Steve Keen concedes defeat in his bet with Rory Robertson and will be hiking from Canberra to the top of Australia’s highest mountain wearing a teeshirt that reads ‘I was hopelessly wrong on house prices, ask me how.’  Keen’s answer is to blame the gub’nent:

“I didn’t know the government was going to be stupid enough to bring in the first home buyer’s boost”.

While I would agree that the increased first home-owners grant has inflated house prices, transferring wealth from taxpayers to incumbent property owners, it would be an exaggeration to say that this prevented a decline in house prices of the magnitude Keen has been predicting.  Moreover, any forecast needs to discount the likely actions of policymakers.

Steve Keen has inadvertently supplied yet another observation in favour of the efficient market hypothesis, much like Robert Shiller’s suggestion in 1996 that investors should stay out of the stock market for the following decade.  The EMH maintains only that we cannot predict future innovations in asset prices.  It is ironic that both Keen and Shiller have demonstrated the truth of this proposition in the course of trying to refute it.

Perhaps the teeshirt should read, ‘The EMH was right on asset prices, just don’t ask me how’.

posted on 02 November 2009 by skirchner in Economics, Financial Markets, House Prices

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EMT is a joke.

If Steve Keen lost his bet and provided an observation in favour of EMT.  Did the other side of the bet and Rory Robertson refute it?

Posted by .(JavaScript must be enabled to view this email address)  on  11/03  at  03:36 PM


Keen was saying that house prices weren’t reflecting readily observable fundamentals, while Rory was arguing that they did.  The latter approach is more consistent with the EMH than the former.

Posted by skirchner  on  11/03  at  09:08 PM


Interestingly, I didn’t see Keen now predict steeply lower house prices with the staged reduction of the FHOG.

Posted by .(JavaScript must be enabled to view this email address)  on  11/05  at  12:39 AM



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