Historical performance · 3 short notes
A return number hides the journey
A single return compresses a whole period into one figure. Read the path, the assumptions, and the available observations before comparing historical results.
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Field note 1 of 3
The ending value is only one point
A cumulative return records where a historical path ended. It leaves out how sharply the portfolio fell, how long recovery took, and which periods shaped the result.
Illustrative path only: the line shows a sequence, not a forecast or a measured portfolio.
Field note 2 of 3
Read the path beside the result
Pair the return with drawdown, recovery time, and the periods that drove the outcome. These describe different parts of the same selected history.
Different historical lenses describe different features of one observed window.
Field note 3 of 3
A comparison needs a shared setup
Dates, fees, cash treatment, and rebalancing rules affect the reconstruction. Change one, and you are asking a different historical question.
The common span and assumptions define what can be compared.
Source
Research concept: Historical performance. The source explains why a return should be read with its path, drawdowns, recovery time, and observation coverage.
Evidence boundary
Historical performance describes a selected past window and its assumptions. It does not establish a likely future return, suitability, or a guarantee; short windows and incomplete data can make comparisons fragile.
Historical performance describes a selected past window and its assumptions. It does not establish a likely future return, suitability, or a guarantee; short windows and incomplete data can make comparisons fragile.