I think the story is more complicated than that, Joe.
F40's were trading (2nd hand) at well over $1 million (IIRC) when they were first launched. It was the reason that Ferrari lifted the originally limited number of cars to be built (300?), and built 1300 of them.
F40's have also not kept their value all the time. They have gone down during the financial crisis, at least in the UK. In 2008/2009 you could buy an F40 in the UK for GBP200k, around 1/3 lower than a couple of years before that. In 2006 they were more expensive, and since then they have doubled in price. I still kick myself for not buying one in 2009.
So in my head (but I think there are gaps in my knowledge too) we had:
1. Two prices in the beginning: factory price and skyrocket second-hand price
2. Settling of the market due to more cars being made. Slow rise to 1991.
3. Crash of Ferrari prices world wide in 1992
4. Slow rise to circa 2001, then accellerating rate to 2008
5. Drop in 2008/2009
6. Rapid increase from 2009, particularly during 2011/2012.
Of course there is also a difference between good cars and not so good cars. In dips there is much less of a difference between them, in markets such as now there is a massive gap.
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