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Module 5 of 8 10 min

Diversification

Why owning many things reduces the damage any one can do.

Course lessons

Step 1

The lesson

Diversification means spreading your money across many different investments, so no single one can sink you. It's the investing version of "don't put all your eggs in one basket."

Some risks belong to a single company — a failed product, a scandal, a new competitor. Diversification shrinks those risks dramatically, because one company's bad year is a small slice of the whole.

Other risks hit almost everything at once — recessions, interest rate changes, market panics. Diversification can't remove those. It reduces risk; it doesn't eliminate it.

  • Across companies: many businesses, not a few.
  • Across industries: tech, health care, energy, consumer goods, and more.
  • Across asset types: stocks and bonds behave differently.
  • Across countries: U.S. and international markets.

Step 2

See it

Portfolio loss when one company drops 50%Hypothetical example

If all your money is in one company and it drops 50%, your portfolio loses 50%. If your money is split evenly across 20 companies and one drops 50%, your portfolio loses 2.5%.

Step 3

Real-world example

One basket vs. twenty

Two investors each put in $1,000. Then one company in the market has a disastrous year and drops 50%.

  • Investor A put everything in that company: $1,000 → $500.
  • Investor B split $50 across 20 companies, including that one: she loses $25, or 2.5%, from that stock.

Investor B also gave up the chance of a huge gain from one company. That's the trade: diversification gives up lottery-ticket upside to avoid wipeouts.

Step 4

Knowledge check

Answer each question, then check your answer to see the explanation. Retake it as many times as you like.

Question 1 of 3

ScenarioYour money is split evenly across 25 companies. One of them goes out of business.About how much of your portfolio did you lose from that company?

Choose an answer.

Step 5

Summary

Diversification spreads money across many investments so no single failure can do much damage. It sharply reduces company-specific risk, but it can't prevent market-wide drops. Spread across companies, industries, asset types, and countries.

Step 6

What you should remember

  • Diversification = don't put all your eggs in one basket.
  • It shrinks single-company risk — not market-wide risk.
  • Many companies in one industry isn't truly diversified.
  • It trades lottery-ticket upside for protection from wipeouts.

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