Diversification Explained
📖 7 最小読み取り
Quick Answer
Diversification is famously called the only free lunch in investing — a way to reduce risk without necessarily reducing returns. It is a simple idea everyone has heard ("don’t put all your eggs in one basket") yet few apply well. Here is how it actually works, and where Bitcoin fits.
💡 次のように考えてください…
Carrying your eggs in several baskets on different paths. Drop one basket and you still have breakfast. Diversification means no single failure — one company, one country, one asset — can break you.
Why it works
Different assets rise and fall at different times. When you spread money across uncorrelated investments — stocks, bonds, property, gold, cash, and a little Bitcoin — a crash in one is cushioned by stability or gains in others. The portfolio’s overall ride gets smoother.
Correlation is the key
Diversification only helps if your assets are not all driven by the same forces. Owning ten tech stocks is barely diversified — they crash together. True diversification mixes assets that behave differently, which is part of Bitcoin’s appeal: over long horizons it has often marched to its own drum.
Where Bitcoin fits
In a diversified portfolio, Bitcoin is typically a small, high-risk, high-potential slice — an asymmetric bet and a hedge against currency debasement. Its volatility means a little goes a long way; its independence from the traditional system is the diversifying benefit.
Don’t over-diversify
There is a limit: own too many things and you just track the market while drowning in complexity ("diworsification"). The goal is enough variety to survive any single shock, not so much that nothing you own can actually matter.
🔑 重要なポイント
Diversification spreads money across assets that behave differently, reducing risk without necessarily cutting returns — the only "free lunch" in investing. Bitcoin fits as a small, uncorrelated, asymmetric slice. But don’t over-diversify into meaningless complexity.
これがあなたにとって重要な理由
For Asian savers often over-concentrated in property or a single currency, diversification — including a small, uncorrelated Bitcoin allocation — is a powerful way to reduce risk. Combine it with sane position sizing and self-custody.
よくある質問
Why is diversification called a "free lunch"?▼
Because, done right, it reduces a portfolio’s overall risk and volatility without necessarily lowering expected returns — a rare win-win in investing, thanks to combining assets that don’t move together.
Is Bitcoin good for diversification?▼
Potentially, as a small slice — over long horizons it has often behaved independently of traditional assets, adding diversification. But it is volatile, so position sizing matters; a little goes a long way.
Can you diversify too much?▼
Yes — owning too many assets ("diworsification") just tracks the market while adding complexity and cost. The goal is enough variety to survive any single shock, not endless holdings.