Alternative Histories
Alternative histories are the plausible paths that could have happened but did not. Taleb uses the idea to attack outcome worship. A decision is not validated simply because one realized path ended well. The realized path is only one draw from a wider set of possibilities.
Why This Changes Judgment
Most people evaluate decisions as if reality were a courtroom with one final verdict. The trade worked, so the trader was smart. The company failed, so the strategy was foolish. Taleb's correction is harsher and more useful: ask what would happen if the same process were replayed across many worlds.
If one lucky path survives while many nearby paths end badly, the success is not strong evidence of skill. It may be evidence of hidden fragility plus one favorable draw. That is why the concept belongs beside decision-quality-vs-outcome but carries more probabilistic bite.
The Practical Use
Alternative histories force you to think in distributions rather than anecdotes. Before trusting a result, ask:
- what were the other plausible paths here?
- how many ended in mere survival, and how many ended in ruin?
- did the process create a wide range of possible outcomes or a narrow one?
- would I still approve this decision if this particular run had gone badly?
This lens is especially important in trading and investing because leverage, illiquidity, and tail risk can hide inside a good-looking realized path for a long time.