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Yet again I do agree, I was just saying that performance over the past 10 years which included some downturns was pretty good. Do many funds exist over 25 to 40 years? I know some IT's do but in general I think I'd rather rely on data from the past 10-15 years if the funds exist over that period. I really don't disagree with you but I don't see how we can assess data from so long ago and even then portfolio and fact sheets change over time so maybe we can't assess like for like over a longer period?
Just looked at the 20 year chart for Scottish Mortgage IT. By the middle of 2008 it looks to have risen about 170% since June 1997. It then dropped back to the June 1997 level by the end of 2008, so you would have been back where you started after about eleven and a half years.