🎯 In 30 seconds: Investing means owning businesses for years and letting their growth do the work. Trading means trying to profit from price moves over minutes, days or weeks. Trading needs more time, skill and discipline, and it costs more in spreads and taxes. Large studies of real brokerage accounts find that most very active retail traders do worse than a simple index fund, and most day traders lose money. This course teaches both so you can choose with your eyes open.
Two ways to use the same market
An investor buys a share because they expect the business to be worth more in five, ten or twenty years. Daily price moves are mostly noise to them. Their main questions are about the business: is it growing, profitable, well run, and fairly priced?
A trader buys a share because they expect the price to move in a particular direction soon, and plans to sell when it does, or when it proves them wrong. Their main questions are about price: where is it likely to go next, where am I wrong, and how much can I lose?
Neither is "gambling" by definition, and neither is automatically "smart". Both can be done carefully or recklessly. The difference is the time frame, the tools, and how often you are making decisions.
The four main styles
| Style | Typical hold | Time needed | Main tools | Main risk |
|---|---|---|---|---|
| Day trading | Seconds to hours, flat by the close | Hours every market day | Intraday charts, volume, VWAP, fast execution | Costs, speed, emotional decisions |
| Swing trading | Days to a few weeks | 30 to 60 minutes a day | Daily charts, support and resistance, earnings dates | Overnight gaps, news |
| Position trading | Weeks to months | A few hours a week | Weekly charts, trends, fundamentals | Big trend reversals |
| Long-term investing | Years to decades | A few hours a month or less | Financial statements, valuation, index funds | Long bear markets, single-company failure |
Each style gets its own chapter later: Day trading, Swing trading and Position trading and trend following. The long-term approach is the core of A plan for a young person.
What the research says about active traders
This is the part most trading ads leave out. Three well-known studies looked at real accounts, not surveys or simulations.
US brokerage households, 1991 to 1996. Brad Barber and Terrance Odean studied 66,465 households at a large discount broker. The households that traded most earned 11.4% a year, while the market returned 17.9%. The average household earned 16.4%, also behind the market. Their conclusion, in the paper's title: trading is hazardous to your wealth.
Day traders in Taiwan, 1992 to 2006. Using detailed trading records from Taiwan's stock market, Barber, Lee, Liu, Odean and Zhang found that day traders as a group lost money, that 74% of day trading volume came from traders with a history of losses, and that 97% of day traders were likely to lose money in future day trading.
Day traders in Brazil, 2013 to 2015. Chague, De-Losso and Giovannetti followed everyone who started day trading in the Brazilian equity futures market in those years and kept at it for at least 300 days. 97% lost money. Only 0.4% earned more than a bank teller, about US$54 a day.
These are different countries, decades and products, and they point the same way. A small minority of active traders do succeed. Most do not, and the most active usually do worst.
Why most active traders fall behind
- Costs add up. Every round trip pays the bid-ask spread and some slippage, even with zero commission. Many small costs per trade, times hundreds of trades, becomes a large drag.
- Taxes. In the US, gains on assets held one year or less are short-term and taxed as ordinary income. Long-term gains usually get a lower rate. Frequent trading turns almost everything into short-term gains. See Taxes for traders.
- Competition. On the other side of many trades are professional firms with faster data, better tools and more capital.
- Behavior. Overconfidence, chasing losses, selling winners too early and holding losers too long. The Barber and Odean paper points to overconfidence as the main explanation for excessive trading. See Trading psychology.
Worked example: the cost hurdle
Hypothetical. You have a $10,000 account. Each trade uses the whole account, and each round trip (buy and sell) costs you 0.10% in spread and slippage, which is $10. No commissions.
| 10 round trips a year | $100 (1% of the account) |
| 50 round trips a year | $500 (5%) |
| 100 round trips a year | $1,000 (10%) |
| 250 round trips a year (about one per trading day) | $2,500 (25%) |
At one round trip a day, you must make 25% a year before costs just to break even, and then pay ordinary income tax on any profit. A low-cost index fund starts with almost no cost hurdle. That does not make trading impossible; it means a trading strategy needs a real edge, not just good days.
So why learn trading at all?
Because the research describes averages, not destiny, and because trading skills are useful even if you mostly invest.
- Risk management (position sizing, stop losses, expectancy) makes you a better investor too.
- Reading charts and order books helps you buy and sell long-term holdings at better prices.
- Understanding options and leverage protects you from products that can hurt you, even if you never use them.
- Testing ideas honestly with paper trading and a backtester teaches you to separate luck from skill. See Does technical analysis work?
The approach this course suggests: a large core in low-cost diversified investments, and a small, capped satellite for trading that you can afford to lose while you learn. If after a year of honest records your trading beats the index after costs and taxes, you have evidence to grow it. If not, the core kept you on track.
Questions to choose your style
- How much time can you give, every market day, without hurting school, work or sleep?
- How would you feel watching a position fall 10% in an hour? In a month?
- Do you have an emergency fund first? Money you might need soon does not belong in trading. See the emergency fund tool.
- Are you willing to keep a journal and review every trade? Without one, you cannot tell skill from luck. See Keeping a trading journal.
Try it
Run a three-month experiment in the paper trading portfolio. On day one, put half the paper money into a broad S&P 500 fund and never touch it. Trade the other half however you like, writing down the reason for every trade. After three months, compare the two halves after an assumed 0.10% cost per round trip. Whatever the result, you will have your first honest data point.
- In the Barber and Odean study, what did the households that traded most earn, compared with the market? Answer: 11.4% a year, while the market returned 17.9%.
- In the Brazil study of people who day traded for at least 300 days, how many lost money? Answer: 97% lost money. Only 0.4% earned more than a bank teller.
- You have a $10,000 account and each round trip costs 0.10% ($10). What do 250 round trips a year cost you? Answer: $2,500, which is 25% of the account. You must make that much before costs just to break even.
- A trade goes wrong and you are tempted to call it a "long-term investment". What does the chapter tell you to do? Answer: Label every dollar as investing or trading before you place the order, and keep them in separate accounts if you can, so a losing trade does not quietly become an investment.
Sources
- Barber and Odean (2000), Trading Is Hazardous to Your Wealth, Journal of Finance (abstract on RePEc)
- Barber, Lee, Liu, Odean and Zhang (2020), Learning, Fast or Slow, Review of Asset Pricing Studies (abstract on RePEc)
- Chague, De-Losso and Giovannetti (2019), Day Trading for a Living? (abstract on RePEc)
- Investor.gov (SEC): Day trading
- IRS: Topic no. 409, Capital gains and losses