Diversify: Don't Put All Your Eggs in One Basket

Example: $100 in one company vs. $100 across ten

Imagine you have $100 to invest. In Plan 1, you put all $100 into a single company. In Plan 2, you put $10 into each of ten different companies.

Now something bad happens: one company runs into serious trouble and its shares become worth nothing.

Plan 2, others grow 5%: 9 companies × $10 × 1.05 = $94.50

Of course, if your one company had done amazingly well, Plan 1 would have won. That is the trade-off: diversification gives up the chance of a giant win from one lucky pick in exchange for protection against a giant loss. Since nobody can reliably predict which company will soar, most long-term investors choose protection.

Why it matters

Even great companies can stumble. Products go out of style, competitors show up, and surprises happen that nobody saw coming. Diversification means you don't have to be right about everything — you just need the whole group to do okay over time.

One common way people diversify is with an index fund, which holds small pieces of many companies at once. For example, a fund that tracks the S&P 500 holds roughly 500 large U.S. companies, so one share of the fund spreads your money across all of them.

Real diversification also means spreading across different kinds of businesses. Owning ten companies that all sell the same thing is closer to one basket than ten.

Common mistake: "I'm diversified — I own five tech companies"

If all your investments are in the same industry, they often rise and fall together. Bad news for that industry hits every basket at once. Spreading across different industries — food, healthcare, energy, technology, and more — is what actually reduces risk.