Don’t forget most international returns and all US returns will be in USD. The USD depreciated 0.7% p.a. to the CHF last hundred years. And in the last 20 years that depreciation has even accelerated (>2%p.a.), with no end in sight.
And I saw @Cortana 's unit on the y axis is CHF.
So I’d subtract 1% from an “average return of 6%” if measuring the returns in CHF.
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