Day 25: Compare individual stocks with index funds

By the end of this lesson you can

Measure your picks against a fund
Understand why most picks trail the index over time
Decide what role stock picking plays for you

A fair comparison

Compare each stock you hold with SPY over the same dates. The simulator shows each holding’s gain, and the portfolio chart shows SPY scaled to your starting cash.

Short periods are dominated by luck. A few weeks says almost nothing about skill.

Why the index is hard to beat

A broad index holds the market’s biggest winners automatically. Long-run stock returns have been concentrated in a minority of companies, so a small portfolio can easily miss them. Add costs and taxes, and most active strategies have trailed the index over long periods.

A place for picking

Picking stocks can still be worthwhile for learning, interest, or conviction backed by research. Keeping it to a deliberate share of the portfolio limits the cost if your picks lag.

Try it in VEXA

Compare a stock with SPY →

Real data, so the numbers will differ from the lesson’s examples.

Key terms

Active return (excess return): Your return minus the benchmark’s return over the same period.
Skill versus luck: The difficulty of telling whether a result came from good decisions or chance.

Full glossary →

Paper Challenge task

Open each holding in Stock Analysis and compare its return since you bought it with SPY over the same dates.

Open the Paper Challenge

Simulated trading with virtual money on real end-of-day prices. Nothing is bought or sold for real, and results in a game do not predict real-world results.

Try it

Record each holding’s return versus SPY since purchase in your journal.

Key takeaways

Compare with the benchmark over the same dates.
Short-term results are mostly luck.
Indexes are hard to beat after costs.
Keep stock picking to a deliberate share.