@chris, suggest you read first and then consider rational behaviour. Your combination of hindsight and self-righteousness is quite a heady naive mixture as your understanding of mental accounting, human behaviour and rational actors is manifestly flawed. In time we may become more German than the German's.
While I haven't read the full article in detail I don't think that the author is equating actual human behaviour with rational human behaviour; I would certainly agree with that. People often behave in very irrational ways especially when bubble manias kick in and everyone tries to follow the crowd. But that does not excuse the bahaviour, when not all humans in all countries behaved that way.
I am not applying hindsight or self- righteousness to any of this. I also bought a house in 2004, but did so in a very rational way by limiting myself to an 85% mortgage of an amount no more than 3 times our combined earnings. Even if I had not sold the house in 2008 we would have been able to service the mortgage on one income and we had a rainy day fund that would cover at least 12 months should both of us be out of work. This was the rational and correct thing to do, but many people in this country including many people I know did not think the same. I have posted here before about how people I know ridiculed me in 2004 when I told them it was dangerous and irresponsible to not take the same approach as we did.
My point - probably badly made - was that even if you were cautious and applied sensible multiples back in 2005 (or earlier) you would still have been caught because no-one could have foreseen how bad this was going to get. Applying discounts based on what has happened would have meant that no-one would have bought.
I don't think that the point was necessarily badly made I just think that your calculations were flawed. People were taking out mortgages for up to 7 or 8 times combined income. Friends of mine who bought in the 90s said that at the time the maximum you could take out is 3 times the higher wage plus one time the lower wage. This is the way it has always been in Germany and very similar in Switzerland (two countries that do not suffer from recurring real estate bubbles). But somewhere along the way people and banks decided that higher multiples were perfectly prudent, when even without hindsight they weren't.
In fact taking out any mortgage or debt back then based on the PROBABILITY of reduced income/redundancy was, in hindsight, reckless.
This is where I disagree. I think that foresight should have told people that if you take out a huge loan for a very long time then you have to make provisions for adverse financial conditions. Way too many people did not look at the possibility of downside risk at all; it wasn't a case that they acknowledged it, but decided it wasn't a high risk, they simply did not take it into the equation at all.
Incidentally, Chris, the "official" voice of Mc Williams and a few others like him were advised to commit suicide by the most official voice of all -our beloved leader at the time - for daring to suggest any negativity.
Yes, you are right about the people who tried to warn us being silenced and ridiculed, but that does not excuse the fact that more people did not listen to them.
While Ahern was the most official voice of the country that does not equate to any level of competence in economic matters. Politicians of all kind lie through their teeth to make themselves look good and will only listen to voices that tell them they are on the right track. That is not something that is new to our current times. You cannot trust politicians and you shouldn't believe anything until it has been officially denied.