[quote user=ThomasBeyer]
One has to have good assumptions about the future before one does s.th.
For example, you assume right now, as you read this, that the screen in front of you will not explode in your face, otherwise you'd take cover and not read it. Hence you predict that for the next minute at least the screen will not explode [although it may].
i..e in your case by investing in the US you make some implicit assumptions about interest rates [that they will not go to 18% in a day], house prices [that they will likely not drop another 50% but are on the eventual rise], states that are stable due to economic growth [ such as TX ..], house price appreciation, rental demand, rental rates, utility prices, construction volume, competition etc. ..
Those things may have been your assumptions, but none of them crossed my mind (including exploding monitor).
#1. Can I have the assumption if I never gave it a thought?
#2. If I never thought about it can it be a good assumption?
If the answer to #1 and #2 is 'yes', then it would appear that assumptions are 'good' if they come true and financial assumptions are 'good' if they make money.
Assumptions appear to be both trivial (i.e. exploding monitor) and non-trivial (come true/make money).
If that is the case, then the only assumption I appear to be making is that stocks and real estate make me a lot of money when I buy them at distressed prices.
The other examples, for me, are trivial assumptions.
To be clear, I don't consider it worth a thought if my monitor will explode, interest rates go to 18% in a day, RE prices drop another 50% (which would be more than awesome btw), states are stable due to economic growth, etc.
I never checked them, I never asked about them, I never thought about them. Just like the exploding monitor. They never crossed my mind and now that they have (because you brought them up), I still don't care about them.
For me, assumptions outside of my 1 non-trivial assumption, are a waste of my time.
However, spending a lot of time thinking about my 1 non-trivial assumption is very useful for me.
Hopefully that helps clear up a bit of my thinking on the subject.
PS: I used the term 'predictions' because it is in the title of this thread.