Do not make your finances a single bet
If your assets do not move together completely, spreading exposure can reduce portfolio swings. It cannot remove losses.
Avoid concentrating your money in a lone stock, platform or property.
Diversification can reduce volatility when assets do not move together completely.
Why consider it?
The cited portfolio-selection paper is a mathematical framework. Its result depends on asset returns and how they vary together; it does not measure how much a particular person saves or loses. No numerical outcome benefit is claimed. This is not personalized investment advice.
Read the sources
Source grade B is reproduced from the original work. It does not establish suitability for everyone.
Original item: chapter 5, item 19 ↗Adaptation: Rewritten in English from the locked Chinese original; retained evidence grade and study limits. Effect sizes quoted from the cited source: no quantified effect of the proposed action is claimed; numbers, where present, are descriptive findings, study procedures or guidance parameters.
Make space for a practical habit.
Add this idea to your local checklist.