Why Diversification Matters
Why Diversification Matters
Diversification is the single most important risk management tool available to investors. The idea is simple: do not put all your eggs in one basket. If you hold only one stock and that company has a bad year, your entire investment suffers. But if you hold ten stocks across different sectors, one bad performer is cushioned by the others.
The Mathematics of Loss
Understanding why diversification matters requires understanding the asymmetry of losses. If a stock drops 50%, it needs to rise 100% just to get back to where it started. That is much harder than it sounds.
- KES 100 drops 50% = KES 50
- KES 50 needs to gain 100% to return to KES 100
Diversification reduces the chance that your entire portfolio takes a devastating loss from which it is difficult to recover.
A Kenyan Example
Consider an investor who put all their money into Uchumi Supermarkets in 2014, when the stock was trading around KES 14. By 2020, the stock had been suspended from trading and was nearly worthless. An investor who held Uchumi as just one of ten stocks would have lost only 10% of their portfolio, not everything.
Meanwhile, the same investor who also held Safaricom, Equity Group, and KCB would have seen strong gains in those positions, more than compensating for the Uchumi loss.
What Diversification Does NOT Do
Diversification reduces company-specific risk, but it does not eliminate market risk. When the entire NSE drops during a crisis, most stocks fall together. However, a diversified portfolio typically falls less and recovers faster than a concentrated one.
Diversification is the only free lunch in investing. It lets you reduce risk without necessarily reducing expected returns.